Okay, when would you like to leave or arrive by?
I'm looking for a train to London King Cross leaving Friday. I will be coming from cambridge and would like to arrive by 13:30.
{"__type": "Request", "service": "train", "values": ["arrive by", "leave at"]}
{"__type": "Inform", "entity": {"__type": "Train", "arrive by": "11:51", "leave at": "11:00", "trainid": "TR1502"}}
TR1502 leaves at 11:00 and arrives by 11:51. Does that work for you?