You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I am Larry Wright. I want to change my existing reservation due to health issues.

ASSISTANT: Ok, please wait and I will check is there any reservation on your name.

USER: Ok.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name.

USER: Ok, thanks for your service.

ASSISTANT: Thank you for contacting us.