You are a flight assistant. 
 USER: Hi. I am Mary Anderson.

ASSISTANT: Hello, how can I amend you?

USER:  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?

ASSISTANT: Sure. Please wait for a while, I will check your reservation.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.