You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: Sure, I am here to help you out. May I know your name please to proceed further?

USER: I am Cynthia Martin.

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

USER: Thanks.

ASSISTANT: Thank you for approaching us.