I need a train out of Norwich on Thursday.
What is your destination?
I want to go to Cambridge, I need to get in by 18:00
I have several trains, shall I book one?
As long as I'm there by 18:00 it doesn't matter. 
I have booked you a train arriving at 17:35, the reference number is U0BVSOSQ and the total fee of 17.6 GBP will be payable at the station.
Thank you for your help! Have a good day. Goodbye.
Thank you for using the Cambridge TownInfo Centre; goodbye!