I'd like a train to Leicester to arrive by 9:45.
Okay, where would you like to depart from? 
I'd like to leave from Cambridge, please.
There are 28 trains, do you have a day preference?
I need to leave on Tuesday.
Train TR2863 leaves on Tuesday at 7:21 and arrives at 9:06. Would you like me to book?
I sure would, thanks.  I will need seats for 8 people.
Your reference number is : XNMIHQHK, the total fee is 302.39 GBP payable at the station.  Is there anything else I can do for you?
No thank you. Have a great day!
You as well, enjoy your trip!