generate response: I would like to go to Cambridge after 18:00.. Intent: find_train. Slots: train-day=thursday, train-departure=ely, train-destination=cambridge, train-leaveat=18:00
Response: We have three trains departing from Ely after 18:00. The earliest departing at 19:35 and arriving by 19:52. It'll be a 17 minute trip.