Task-oriented dialogue about: train

I need a train from cambridge to ely.
No problem. What day will you be leaving, and is there a particular time you would like to board?
Yes, I need to leave on Friday sometime after 15:30.
I have a train that leaves Cambridge at 15:50 and arrives in Ely at 16:07, would you like me to book it for you?
Yes, I also would like the reference number.
Sure thing. The number is FAC22HSG . Anything else I can do for you?
I'm sorry, I forgot to specify that I need 6 tickets. Could you change that for me?
Surely, I have made that change and the new reference number is YWF1K74N . Is there anything else I can do for you?
Thanks I appreciate it. That's all I need!
You're welcome. Enjoy your trip!