I'd like to find a train arriving in peterborough by 8:00.
There are daily departures from Cambridge at 07:06 that arrive in Petersborough at 07:56.  Which day were you planning to travel?
I am planning to travel on Thursday.
There are daily departures from Cambridge at 07:06 that arrive in Petersborough at 07:56. Would you like to book tickets?
Yes, I'll need 4 tickets please. 
Your Booking was successful, the total fee is 66 GBP payable at the station .The reference number is : ZW9TAO4I.
Great, thanks! That's all I needed.
You are quite welcome. Have a good day.