generate response: As long as it leaves on Saturday after 14:15, that's all that matters. Please give me travel time and train id.. Intent: find_train. Slots: train-day=saturday, train-departure=birmingham new street, train-destination=cambridge, train-leaveat=14:15
Response: TR1843 leaves at 14:40 and the travel time is 163 minutes. Would you like to book?