Ok no problem, where will you be coming from and what will be the date & time? The TR0788 departing Broxbourne for Cambridge on Wednesday on 05:32 may suit you. Would you like to book a seat or need more information? Actually, I recommend TR5972. It will arrive in Cambridge at 16:32, which is much closer to your preferred time. The total ride duration is 60 minutes.
I need a train going tocambridge. I'm coming from broxbourne and I'd like to leave on Wednesday and arrive by 17:00. What time does that train arrive? I am good with that.
{"__type": "Inform", "entity": {"__type": "Train", "arrive by": "16:32", "destination": "Cambridge", "duration": "60 minutes", "trainid": "TR5972"}}
{"__type": "Confirm", "entity": {"__type": "Train"}}
Would you like me to book it for you?