generate response: Perfect, I need 7 tickets and the reference number of the booking.. Intent: book_train. Slots: train-arriveby=12:15, train-bookpeople=7, train-day=sunday, train-departure=cambridge, train-destination=london liverpool street
Response: Booking was successful, the total fee is 92.96 GBP payable at the station . Reference number is : 3EPMFSFA .