I am looking for a train that departs from Cambridge on Thursday.
There's a train that leaves at 9 am and arrives at 9:51 am. Is that good?
No, I actually need to leave after 12:00.
Okay, and what is your destination? 
I need to go to ely after 12:00.
I have a train that leaves Ely on Thursday at 13:50 and arrives by 14:07. Would you like to book tickets?
Yes, that would be great. Can you book tickets for 7 people please. And I'll need a reference number for it. 
Booked! Your reference number is UCT2SJ8W. Fee is 30.8, paid at the station. Anything else.
No thank you. That is all.
Okay great. Glad I could be of assistance.