Task-oriented dialogue about: train

Hi, I'm looking to book a train ticket to Liverpool Street station in London. Are there any that depart at or around 18:00?
There is a train departing Cambridge at 17:59 on Wednesday.
I'm actually looking for one on Friday. Are there any that will arrive by 18:00 at Liverpool on Friday?
There is train leaving for Liverpool Street at 5:59 on Friday arriving at 7:27. Would you like to book a seat?
Yes and can you tell me the price of the ticket?
It would be 16.60 pounds
Thank you, that will be all.
Okay, have a great day
Thank you.
Good-bye.