Hi. I am Mary Anderson.
Hello, how can I amend you?
 I want to cancel my recent ticket booking due to office work that my manager did not approved my leaves, so can you please cancel it?
Sure. Please wait for a while, I will check your reservation.
Sure, I will wait.
Thank you for waiting, there is no reservation found on your name.
No problem, thank you for the information.
Thank you for approaching us.