generate response: The one that arrives the closest to 21:30, please. I will need the price and the train ID.. Intent: find_hotel. Slots: train-arriveby=21:30, train-day=sunday, train-departure=cambridge, train-destination=birmingham new street
Response: TR2631 leaves Cambridge at 17:01 and arrives in Birmingham at 19:44. The price is 60.08 pounds.