You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jeffrey Clark.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, I'll definitely help you with that. Please be on hold.

USER: Sure, take your own time.

ASSISTANT: Clark, there is no reservation found under your name to do cancellation.

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

ASSISTANT: Thank you for choosing us.