You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you at present?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: Not an issue, thank you for your help.

ASSISTANT: Thank you for reaching us.