I need a train to Cambridge.
Ok.  Where will you be departing from?
I want to leave from Ely on Friday.
Okay, do you have a desired time for departure or arrival? 
I need to leave after 09:45.
TR0212 departs Ely Friday at 11:35, would you like to book a ticket for this train?
What time does it arrive?
It arrives at 11;52. would you like me to book it for you?
No, I just needed the information.  I am all set, thanks.  Have a nice day.
Great! Thank you for using the Cambridge TownInfo centre. Have a wonderful day!