You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you for the day?

USER: I would like to change my existing reservation, can you help me in that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, myself Nancy Scott.

ASSISTANT: Ok, please be on hold.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, we could not find any reservation against your name.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.