generate response: One ticket please, thank you.. Intent: book_train. Slots: train-arriveby=14:07, train-bookpeople=1, train-day=tuesday, train-departure=cambridge, train-destination=ely, train-leaveat=13:50
Response: Booking was successful, the total fee is 4.4 GBP payable at the station. Reference number is : CKPZRG81 .