You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Larry Walker,  I want to cancel my reservation due to health issue.

ASSISTANT: Just a moment please.

USER: Ok, sure.

ASSISTANT: I am sorry no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.