You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you right now?

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

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your name to check your previous reservation?

USER: I am Carolyn Wright.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our records.

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

ASSISTANT: Thank you for reaching to our services, hope you have a great day.