You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of help that you need form my side?

USER: Dennis Harris here, I want to change my reservation due to my health issue.

ASSISTANT: Sure, please give me a moment.

USER: Ok, have your time.

ASSISTANT: When I have checked there is no reservation status that is obtained in or booking list.

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

ASSISTANT: Thank you for reaching us and have a nice day.