Task-oriented dialogue about: train

Hi! Can you tell me what trains are available on Friday after 18:30?
Certainly, but first I need to know where you are departing from and what your destination is.
I'm going from Stevenage to Cambridge.
The first train after 18:30 is TR4969, which leaves at 19:54. Would you like a ticket, or more information?
Yes I would like to book it for 8 people and I will need the reference number.
Sure, I have booked your tickets for 8 people, your reference number is : T6B9UNBQ .
Thank you for all your help, that's all I needed today.
You're very welcome. Thank you for using Cambridge TownInfo centre.