Hello. I am Samuel Scott.
Hello, how may I oblige you today?
 I want to cancel my reservation due to prepone of my exams. Can you please cancel my reservation?
Sure, we are here to help you. Please hold a moment.
OK.
Thanks for your time, we found a reservation on your name.
Thank you for your help.
Shall I proceed to cancel.
Ok, proceed to cancel.
Sure, your ticket has been cancelled.
 Thank you.
Thank you for approaching us.