generate response: Oh, yes, I meant I need to leave after 15:30. I guess that means it will arrive after 15:30, too, ha ha.. Intent: find_train. Slots: train-day=tuesday, train-departure=peterborough, train-destination=cambridge, train-leaveat=15:30
Response: I have a train that leaves at 15:48 and arrives at 16:38. Would that work for you?