generate response: Yes, please book 1 ticket. May I have the reference number?. Intent: book_train. Slots: train-bookpeople=1, train-day=saturday, train-departure=cambridge, train-destination=kings lynn, train-leaveat=18:45
Response: I have booked your train. The reference number is JI5O0VTT . The fee is 7.84 GBP payable at the station.