generate response: I need to leave on Monday. I don't care about the departure time.. Intent: find_train. Slots: train-arriveby=20:15, train-day=monday, train-departure=cambridge, train-destination=stansted airport, train-leaveat=dontcare
Response: There is a train from Cambridge to Stansted every hour on the :40 on Monday. The closest arrival to 20:15 is the 11:40, arriving at 12:08.