generate response: The 16:11 train would be fine. I'll need the booking for four people. Can I also have the reference number please?. Intent: book_train. Slots: train-bookpeople=4, train-day=tuesday, train-departure=kings lynn, train-destination=cambridge, train-leaveat=15:15
Response: Booking was successful, the total fee is 39.2 GBP payable at the station. Reference number is : 86PRM3M8 .