Yes, I need to know where you are leaving from and what city you will be going to?
Yes, could you give me some information on a train? I'm leaving from bishops stortford and going to cambridge please.
{"__type": "Request", "service": "train", "values": ["departure", "destination"]}
{"__type": "Request", "service": "train", "values": ["day", "leave at"]}
Great. What day and time do you want to travel?