Hi, I am Mary Rodriguez.
Hello, how may I be of your service?
  I want to cancel my recent ticket booking due to office work that my manager did not approved my leaves. Can you help me in cancellation?
Sure, give me sometime to check and revert to you.
Ok.
Thank you for your time. We didn't found any reservation matching your name.
Ok, not an issue. Thanks for your information.
Thank you for choosing us.