Task-oriented dialogue about: train

I'm looking for a train that will be going to london kings cross on Wednesday.
There are ten trains departing from Cambridge and arriving in London Kings Cross on Wednesday. Do you need to arrive by a certain time?
I need it to arrive by 18:00.
How about TR8676 that leaves at 19:00?
i want to book for three people. help me get the reference number too
I'm sorry for the confusion, that train won't arrive by 18:00. TR3843 will arrive by 17:51, does that sound like it will work?
Yes, please book for 3 people. I will need a reference number also.
Booking was successful, the total fee is 70.8 GBP payable at the station. Reference number is : H6YK4BJL .
Thank you for your help!
You're certainly welcome. My pleasure, sir. Anything else I may do for you today?
You've covered it all. Thanks a million. Goodbye.
Happy to be of service. Please let us know if we can assist you in the future.