You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Myself David Brown. can you help me to cancel my recent reservation?

ASSISTANT: Sure, I will help you with the flight ticket cancellation.

USER: Thanks.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it.

USER: No issues, thank you for your help.

ASSISTANT: Thank you.