diff --git a/chrono/api/serializers.py b/chrono/api/serializers.py
index 10058394..15adc9cd 100644
--- a/chrono/api/serializers.py
+++ b/chrono/api/serializers.py
@@ -164,6 +164,10 @@ class BookingSerializer(serializers.ModelSerializer):
         fields = [
             'id',
             'in_waiting_list',
+            'user_first_name',
+            'user_last_name',
+            'user_email',
+            'user_phone_number',
             'user_was_present',
             'user_absence_reason',
             'user_presence_reason',
diff --git a/chrono/api/views.py b/chrono/api/views.py
index 24d6aab0..9c9c3e7f 100644
--- a/chrono/api/views.py
+++ b/chrono/api/views.py
@@ -2419,13 +2419,24 @@ class BookingAPI(APIView):
             self.booking.extra_data.update(extra_data)
             self.booking.save()
 
-        if 'user_was_present' in request.data:
-            self.booking.secondary_booking_set.update(user_was_present=self.booking.user_was_present)
-            self.booking.event.set_is_checked()
+        secondary_bookings_update = {}
+        for key in [
+            'user_was_present',
+            'user_first_name',
+            'user_last_name',
+            'user_email',
+            'user_phone_number',
+        ]:
+            if key in request.data:
+                secondary_bookings_update[key] = getattr(self.booking, key)
         if 'user_absence_reason' in request.data or 'user_presence_reason' in request.data:
-            self.booking.secondary_booking_set.update(user_check_type=self.booking.user_check_type)
+            secondary_bookings_update['user_check_type'] = self.booking.user_check_type
         if extra_data:
-            self.booking.secondary_booking_set.update(extra_data=self.booking.extra_data)
+            secondary_bookings_update['extra_data'] = self.booking.extra_data
+        if secondary_bookings_update:
+            self.booking.secondary_booking_set.update(**secondary_bookings_update)
+        if 'user_was_present' in request.data:
+            self.booking.event.set_is_checked()
 
         response = {'err': 0, 'booking_id': self.booking.pk}
         return Response(response)
diff --git a/tests/api/test_booking.py b/tests/api/test_booking.py
index 1b600962..07ed8df3 100644
--- a/tests/api/test_booking.py
+++ b/tests/api/test_booking.py
@@ -145,6 +145,10 @@ def test_bookings_api(app, user):
         {
             'id': meetings_booking1.pk,
             'in_waiting_list': False,
+            'user_first_name': '',
+            'user_last_name': '',
+            'user_email': '',
+            'user_phone_number': '',
             'user_was_present': None,
             'user_absence_reason': '',
             'user_presence_reason': '',
@@ -153,6 +157,10 @@ def test_bookings_api(app, user):
         {
             'id': events_booking1.pk,
             'in_waiting_list': False,
+            'user_first_name': '',
+            'user_last_name': '',
+            'user_email': '',
+            'user_phone_number': '',
             'user_was_present': None,
             'user_absence_reason': '',
             'user_presence_reason': '',
@@ -162,6 +170,10 @@ def test_bookings_api(app, user):
         {
             'id': events_booking2.pk,
             'in_waiting_list': False,
+            'user_first_name': '',
+            'user_last_name': '',
+            'user_email': '',
+            'user_phone_number': '',
             'user_was_present': None,
             'user_absence_reason': '',
             'user_presence_reason': '',
@@ -575,7 +587,7 @@ def test_booking_patch_api_present(app, user, flag):
     app.patch_json('/api/booking/%s/' % booking.pk, params={'user_was_present': flag})
     booking.refresh_from_db()
     assert booking.user_was_present == flag
-    # all secondary bookings are upadted
+    # all secondary bookings are updated
     assert list(booking.secondary_booking_set.values_list('user_was_present', flat=True)) == [flag, flag]
     other_booking.refresh_from_db()
     assert other_booking.user_was_present is None  # not changed
@@ -854,6 +866,41 @@ def test_booking_patch_api_both_reasons(app, user):
     assert resp.json['err_desc'] == 'invalid payload'
 
 
+def test_booking_patch_api_user_fields(app, user):
+    agenda = Agenda.objects.create(kind='events')
+    event = Event.objects.create(agenda=agenda, start_datetime=now(), places=10)
+    booking = Booking.objects.create(event=event)
+    # make secondary bookings
+    Booking.objects.create(event=event, primary_booking=booking)
+    Booking.objects.create(event=event, primary_booking=booking)
+    # and other booking
+    other_booking = Booking.objects.create(event=event)
+
+    app.authorization = ('Basic', ('john.doe', 'password'))
+
+    to_test = [
+        ('user_first_name', 'fooo'),
+        ('user_first_name', ''),
+        ('user_last_name', 'baaaar'),
+        ('user_last_name', ''),
+        ('user_email', 'fooo@baaaar.com'),
+        ('user_email', ''),
+        ('user_phone_number', '0606'),
+        ('user_phone_number', ''),
+    ]
+    for key, value in to_test:
+        params = {
+            key: value,
+        }
+        app.patch_json('/api/booking/%s/' % booking.pk, params=params)
+        booking.refresh_from_db()
+        assert getattr(booking, key) == value
+        # all secondary bookings are updated
+        assert list(booking.secondary_booking_set.values_list(key, flat=True)) == [value, value]
+        other_booking.refresh_from_db()
+        assert getattr(other_booking, key) == ''  # not changed
+
+
 def test_booking_patch_api_extra_data(app, user):
     agenda = Agenda.objects.create(kind='events')
     event = Event.objects.create(agenda=agenda, start_datetime=now(), places=10)