generate response: If there are no trains departing from Stansted at 13:15, then 12:15 will have to do. How long will it take me to get to Cambridge?. Intent: find_train. Slots: train-arriveby=13:15, train-day=sunday, train-departure=stansted airport, train-destination=cambridge
Response: It will take 28 minutes. Do you need to make a booking:?