generate response: I would like a train that leaves after 13:00 and goes to Cambridge from Stansted Airport. I'd like it to be on Tuesday.. Intent: find_train. Slots: train-day=tuesday, train-departure=stansted airport, train-destination=cambridge, train-leaveat=13:00
Response: TR6312 departs at 13:24 and arrives by 13:52. Would you like a ticket?