I'm hoping to book a train.
Where and when are you departing from?
I'm going to Ely from Cambridge on Sunday.  Thank you.  
great, what is your preferred departure or arrival time?
I would like to arrive by 20:15. 
The first train leaves at 5:50.
Do you have something that leaves later but still makes the arrival time?
There's a train that arrives at 20:07. If you don't want to cut it that close, there's an earlier train that arrives at 18:07.
Give me the arrival time and train ID of the earlier train. Also find me a cheap restaurant that serves north american food if available or Indian food.
The arrival time of the TR5389 is 18:07. There are four restaurants that meet your criteria. Would you like a recommendation?
Yes, any you choose will be fine. I'll need to book a table for the same day, at 15:30, and it will just be me. 
I booked you a table at kohinoor! Here is your reference number ZTGXVBXU. Anything else I can do for you?
Great, that's all I need, thanks so much for your help! Have a great day!
Have a good day as well. Bye.