generate response: Let's pick something arriving between 11:00 and 10:30. It needs to depart from cambridge and leave on tuesday.. Intent: find_train. Slots: train-arriveby=10:30, train-day=tuesday, train-departure=cambridge, train-destination=london liverpool street
Response: Train TR4259 arrives in London Liverpool Street at 9:27. It's the closest arrival time to 11:00. How many tickets would you like to book?