You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Jeffrey Johnson is here. I just want to change my existing reservation due to my health issue.

ASSISTANT: Sure.

USER: Ok.

ASSISTANT: Please wait for a moment, I will check the status and let you know.

USER: Sure, take your time.

ASSISTANT: We did not found any reservation on your good name.

USER: Not an issue. Thank you for your information.

ASSISTANT: Thanks for choosing us.