generate response: I'll need one that I can book tickets for 7 people, lets try the one that departs at 21:40 first.. Intent: book_train. Slots: train-bookpeople=7, train-day=monday, train-departure=birmingham new street, train-destination=cambridge, train-leaveat=20:45
Response: Great, I booked your train for 7. Your reference number is DI6ZQL94 . Is there anything else I can help with?