You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you for today?

USER: I am Carolyn Turner. I am planing to change an existing reservation, due to health issue. Can you please change my reservation?

ASSISTANT: Yes, I can help you. Give me a moment.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's fine.

ASSISTANT: Thank you for consulting us.

USER: Thank you for your service.