You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am William Moore. As my sister's marriage is postponed, Can you please cancel my reservation?

ASSISTANT: Sure. Please wait for a while. I will check and let you know.

USER: Ok.

ASSISTANT: We have not found any reservation on your given name.

USER: Thank You.

ASSISTANT: Thanks for choosing us.