To better help you find the right train, what day are you wanting to travel on?
I need a train from cambridge to leicester. I need to travel on Saturday and I need to arrive by 19:15.
{"__type": "Request", "service": "train", "values": ["day"]}
{"__type": "Inform", "entity": {"__type": "Train", "trainid": "TR7457"}} {"__type": "Request", "service": "train", "values": ["book people"]}
The train TR7457 meets your specifications. How many tickets would you like?