You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Charles Anderson. I am planning to a cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, I will help you with the flight reservation cancellation. I have searched online but I could not find your flight reservation to cancel it.

USER: Sure. Thank you.

ASSISTANT: Thank you.