diff --git a/booker.py b/booker.py
index de6eeb3..24144e4 100644
--- a/booker.py
+++ b/booker.py
@@ -35,9 +35,9 @@ if __name__ == "__main__":
             logger.info("Try to get an appointment at %s", datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
             data = BookingData(name=args.name, email=args.email)
             svc = BookingService(url, debug=False)
-            for booked in svc.book(data):
-                if data == booked:
-                    break
+            booking = svc.book(data)
+            if booking is not None:
+                break
             time.sleep(max(30, args.interval))
         except KeyboardInterrupt:
             logger.info("Got keyboard interrupt - stopping.")