Where are you departing from?
Hi I need a train to go to Norwich, I need to leave after 17:45. I'll be leaving from Cambridge on Tuesday.
{"__type": "Request", "service": "train", "values": ["departure"]}
{"__type": "Inform", "entity": {"__type": "Train", "arrive by": "19:55", "leave at": "18:36"}} {"__type": "Offer", "entity": {"__type": "Train"}}
Okay, there is an 18:36 train that will arrive by 19:55. Just that sound good?