generate response: Anything leaving a little bit earlier but after 15:30?. Intent: find_train. Slots: train-day=friday, train-departure=cambridge, train-destination=london kings cross, train-leaveat=15:30
Response: Actually, that is the earliest train available that leaves after 15:30. The next train before that departs at 15:00 which wouldn't fit your criteria. Would you like to book any tickets?