You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how do I assist you?

USER: I want to cancel my recent reservation due to health issues.

ASSISTANT: Ok, may I know your name, please?

USER: I am Karen Thomas.

ASSISTANT: Sorry, Karen Thomas we could not found any reservation.

USER: NO issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your response.

ASSISTANT: Have a nice day.