I am looking for a train leaving from Norwich.
Sure. What time are you looking to leave?
I would like to leave after 09:45
Which day are you looking to travel?
I am looking to go to cambridge on tuesday
Okay, I have 14 trains on that route leaving hourly on the :16 from 10:16 to 23:16. TR0667 leaves at 10:16, arrives at 11:35, with a total duration of 79 minutes.
Ok, do you have one that leaves at 11:16?  Can you provide me with the train id for that one? 
Yes, a train leaves at 11:16 with the ID TR0839.
Thank you very much for your help! 
Glad I could be of assistance.