What's your destination?
I need a train out of Cambridge on Wednesday. I will be going to Broxbourne.
{"__type": "Request", "service": "train", "values": ["destination"]}
{"__type": "Inform", "entity": {"__type": "Train", "choice": "several", "day": "Wednesday", "destination": "Broxbourne"}} {"__type": "Request", "service": "train", "values": ["leave at"]}
There are several departures to Broxbourne on Wednesday, what time would you like to depart?