generate response: 2 tickets on the 21:01, please. And can you give me the reference number once that's booked?. Intent: book_train. Slots: train-bookpeople=2, train-departure=cambridge, train-destination=broxbourne, train-leaveat=21:00
Response: I have booked your tickets. Your reference number is LJWDINYN . Is there anything else I can do for you?