You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Thank you for waiting. No reservation found on your name in my database.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.