generate response: I'll take the 21:39, I'll need 7 tickets please.. Intent: book_train. Slots: train-bookpeople=7, train-day=saturday, train-departure=london liverpool street, train-destination=cambridge, train-leaveat=19:30
Response: Alright, your tickets have been booked and the reference number is ZI1RMKW7 . Is there anything else I can do for you?