Hi, I am Mary Rodriguez.
user
Hello, how may I be of your service?
assistant
  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?
user
Sure, give me sometime to check and revert to you.
assistant
Ok.
user
Thank you for your time. We didn't found any reservation matching your name.
assistant
Ok, not an issue. Thanks for your information.
user
Thank you for choosing us.
assistant