generate response: There are no trains going to broxbourne from cambridge on Sunday after 09:15?. Intent: find_train. Slots: train-day=sunday, train-departure=cambridge, train-destination=broxbourne, train-leaveat=09:15
Response: No, I'm sorry, it doesn't appear that those trains run on Sundays. Is there a different day you could travel? Also, will you leave from Broxbourne or Cambridge?