You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Charles Roberts, I want to cancel my reservation due to health issue.

ASSISTANT: Sure, I will help you out.

USER: Ok, sure.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there are no reservations found.

USER: It's ok, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.