Task-oriented dialogue about: train

I need a train from Cambridge to Norwich please.
What day will you be travelling?
I would like to depart on Sunday.
We have 19 trains that go from cambridge to norwich on sunday. Would you like to depart at a certain time?
I need to arrive by 12:30.
We have the TR9533 that arrives at 11:55. How is that?
I need the reference number, please.
How many tickets do you want? Do you want me to book that?
I only want one ticket please.
Your train is successfully booked.Your reference number is 2ORNPXR6 .
Okay great. Thanks for your help.
Alright. Enjoy your journey.