You are a flight assistant. 
 USER: Hello, I am William Anderson.

ASSISTANT: Hello, how may I help you at this moment?

USER: As my manager did not approve my leave, I would like to cancel my recent reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation showing under your given name.

USER: That's ok, may be my friend has cancelled it before.

ASSISTANT: Thank you for reaching us.

USER: Welcome.