We have several trains going to cambridge. Where are you coming from?
I would like to see if you can find a train that leaves to cambridge. Also, can it be on a thursday too? I'll be leaving from the birmingham new street station.
{"__type": "Inform", "entity": {"__type": "Train", "choice": "several", "destination": "cambridge"}} {"__type": "Request", "service": "train", "values": ["departure"]}
{"__type": "Request", "service": "train", "values": ["arrive by", "leave at"]}
Do you have any time constraints?