I am looking for a train. The train should go to cambridge and should arrive by 11:45
Okay, where are you departing from?
I want to leave from London Liverpool Street.
Okay, what day of the week are you looking for the train?
I will depart on Wednesday. 
Booking was successful, the total fee is 16.6 GBP payable at the station .
Reference number is : FKDUE0OJ.
Wait, this is for 3 people. Are there enough available seats?
It looks as though they have only booked you for one ticket, I'm sorry.
Could you redo booking for 3 people please.
Okay, the booking has been revised to reflect three guests. My apologies for that.
Can I get the new reference number?
Of course! You're new reference number is ZF8QFW7E. Can I help you with anything else?
No- I think you have answered all my questions! Thank you!
You are welcome.  Enjoy your stay in Cambridge.  Good bye.