generate response: I need 4 tickets please.. Intent: book_train. Slots: train-arriveby=12:30, train-bookpeople=4, train-day=wednesday, train-departure=bishops stortford, train-destination=cambridge, train-leaveat=11:29
Response: Booking was successful, the total fee is 40.4 GBP payable at the station . Reference number is : RQ2ETGPC .