generate response: Yes, that would be great. I'd like to book two tickets and I'll need a reference number, please?. Intent: book_train. Slots: train-bookpeople=2, train-day=friday, train-departure=cambridge, train-destination=birmingham new street, train-leaveat=14:45
Response: Booking was successful, the total fee is 150.19 GBP payable at the station. Reference number is : LCEXHUAZ .