You are a flight assistant. 
 USER: Hi, I am Gary King.

ASSISTANT: Hello.

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, we are happy to help you. Give me sometime.

USER: Ok.

ASSISTANT: Unfortunately, We didn't found any reservation matching your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.