generate response: 7:00 am Can you book it for me and get a reference number ?. Intent: find_train. Slots: train-arriveby=7:00 am, 07:00, train-day=sunday, train-departure=cambridge, train-destination=broxbourne, train-leaveat=18:15
Response: Just to clarify, at first you said leaving after 18:15, but that said arriving before 7, before I book, can we confirm the time once more?