You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Here Lisa Johnson. I need to cancel my recent reservation due to my brother marriage is cancelled.

ASSISTANT: Sure, I am here to help you in cancelling your reservation.

USER: Thank you for positive response.

ASSISTANT: Please give me a moment to check your reservation status.

USER: Sure, take your own time.

ASSISTANT: Sorry Johnson, there is no reservation found on your name in our records.

USER: That's fine, thank you for checking.

ASSISTANT: Welcome.