You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation, could you help me with it? My name is Nancy Davis.

ASSISTANT: Sure Nancy, hold on for a moment please.

USER: Ok.

ASSISTANT: Sorry to say this Davis, we could not found a flight with your name.

USER: No problem. Thank you for assisting me.

ASSISTANT: Thank you for reaching us.