generate response: Yes, please. I need 5 tickets.. Intent: book_train. Slots: train-arriveby=19:00, train-bookpeople=5, train-day=sunday, train-departure=cambridge, train-destination=london liverpool street
Response: Booking was successful, the total fee is 66.39 GBP payable at the station . Reference number is : 8GVKNM9J .