You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please change my existing reservation due to some health issues?

ASSISTANT: Sure. May I know your name please?

USER: Sure, I am Carol Nelson.

ASSISTANT: Thanks for waiting. I have not found your flight reservation to change it.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you.