I need to find a train from ely to cambridge.
What day and time would you like to travel?
I would like to leave on Monday. 
When would you like to arrive in Cambridge on Monday?
I really just need to leave after 15:45. The arrival time doesn't really matter.
should i book it for you?
Yes for 5. All I would need is the reference number.
I have booked 5 tickets for you on TR6645. Your reference number is SZYJ90EL. What else can I assist with?
Thanks for being so helpful! I appreciate your time. I'm all set now.
You're very welcome, I am so glad to have been of service! Have a wonderful day now, bye!