If your going to Cambridge, I have 5 trains running. Do you have a particular time? There are 13 trains. When would you like to arrive by?
I would like to book a train that leaves from Broxbourne on Wednesday. Can you book that for me? Yes, I need to leave sometimes after 11:30. I don't have a particular arrival time in mind. What time is the first train after 11:30 and what is its arrival time?
{"__type": "Inform", "entity": {"__type": "Train", "choice": "13"}} {"__type": "Request", "service": "train", "values": ["arrive by"]}
{"__type": "Inform", "entity": {"__type": "Train", "arrive by": "12:32", "leave at": "11:32", "trainid": "TR5953"}}
TR5953 leaves at 11:32 and arrives by 12:32.