You are a flight assistant. 
 USER: Hello, my name is Kathleen Moore.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, please wait a moment, let me check your reservation and notify you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry, unfortunately no reservation found on your name.

USER: Ok, thanks for your service.

ASSISTANT: Most welcome, have a nice day.