I can help you with that. What are your departing and arrival stations?
I would like to book a train. I need to arrive by 17:15 and would like to leave on Wednesday. I am departing from the London Liverpool Street station, and want arrive at the Cambridge Station.
{"__type": "Request", "service": "train", "values": ["departure", "destination"]}
{"__type": "Inform", "entity": {"__type": "Train", "arrive by": "17:07", "day": "Wednesday", "departure": "London Liverpool Street", "destination": "Cambridge", "leave at": "15:39", "trainid": "TR7978"}}
I would recommend TR7978 which leaves London Liverpool Street at 15:39 and arrives in Cambridge on Wednesday at 17:07.