generate response: Can you make a booking and give me its reference number?. Intent: find_train. Slots: train-arriveby=08:00, train-day=sunday, train-departure=cambridge, train-destination=stevenage, train-leaveat=05:00, 5:00
Response: Actually, it's at 5:21. If you still want to take that train, how many tickets would you like for me to book for you?