You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Sorry Wilson, there is no reservation found under your name to cancel your reservation.

USER: That's fine. Thank you for your service.

ASSISTANT: You are welcome.