You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Joseph Miller here. Due to an health issue, I want to cancel my recent reservation.

ASSISTANT: Sure.

USER: Can you assist me for cancellation?

ASSISTANT: Please hold on a minute, I will check and get back to you.

USER: Ok.

ASSISTANT: Unfortunately, we did not found any reservation on your name.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your service.