You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I address you?

USER: I am Debra Moore. I want to change my existing reservation, due to health issues. Could you help me in changing reservation?

ASSISTANT: Sure, I would be happy to help you. Please wait a moment, I will check and revert you.

USER: Sure.

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

USER: Not an issue. Thanks for your service.

ASSISTANT: Thanks for connecting us.