You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Lewis.

ASSISTANT: How may I aid you?

USER: Owing to an emergency, I would like to cancel my recent reservation. Will you help me with this?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: Ok, not an issue. May be my brother has already cancelled my reservation on behalf of me. Thank you for providing information.

ASSISTANT: Thank you for approaching us.