generate response: How long does the train take to get to Ely? And when, precisely, does it leave?. Intent: find_train. Slots: train-arriveby=17:15, train-day=tuesday, train-departure=cambridge, train-destination=ely
Response: The TR4447 leaves at 15:50 and it's a 17 minute ride, arriving at 16:07. Should I book it for you?