I would be happy to help you. I have 221 trains departing Sunday, what day/time will you be departing and what is your destination?
I need a train that is leaving on sunday and leaving after 13:30. I need to leave Cambridge after 13:30 to go to Stevenage.
{"__type": "Inform", "entity": {"__type": "Train", "choice": "221", "day": "Sunday"}} {"__type": "Request", "service": "train", "values": ["day", "destination", "leave at"]}
{"__type": "Request", "service": "train", "values": ["arrive by"]}
I have trains leaving to there, what time would you like to arrive by?