Great, what time are you thinking? From where will you depart?
I'm hoping to catch a train to London Kings Cross. I need to leave after 19:00. I will be departing from cambridge.
{"__type": "Request", "service": "train", "values": ["departure"]}
{"__type": "Request", "service": "train", "values": ["leave at"]}
Would you like to leave at 19:00?