You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephen Green.

ASSISTANT: Green, how can I aid you today?

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

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry Green, there is no reservation available under your name in our database.

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

ASSISTANT: My pleasure, have a nice day.