You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to cancel my reservation due to some health issues, can you please help me out with that?

ASSISTANT: Sure, may I know your name to check your reservation from our database?

USER: Thank you. Myself Dennis Evans.

ASSISTANT: We regret to inform you that there is no reservation found on your name to cancel.

USER: That's ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for opting us.