In order for me to find the best train to suit you, can you provide me with a preferred departure or arrival time?
I need a train to Cambridge on Saturday. I'll be departing from Peterborough. We'd like to arrive by 12:45.
{"__type": "Request", "service": "train", "values": ["arrive by", "leave at"]}
{"__type": "Inform", "entity": {"__type": "Train", "arrive by": "12:45", "choice": "14"}} {"__type": "Request", "service": "train", "values": ["leave at"]}
There are 14 trains that arrive by 12:45. What time would you like to leave?