I am looking for a train to Cambridge please.
There are many trains to Cambridge. Where will you be departing from? 
I'll be departing from Norwich on Sunday. 
Ok, there doesn't appear to be any trains leaving then.  Could you leave later?
I can leave at 10:45.
I apologize for the earlier confusion. We have several trains that will meet your needs. TR6419 departs Norwich on Sunday at 11:16. Will that work for you?
Yes. can you tell me the total travel time as well?
It is going to be 79 minutes total.
Great, that's all I need. Goodbye!
Have a nice day.