You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Please help me in changing my reservation, as my business meet that I have to attend got postponed.

ASSISTANT: Sure. May I know your good name to check reservation?

USER: I am Sandra Davis.

ASSISTANT: Please hold on.

USER: Ok.

ASSISTANT: I am here to inform you that, there is no reservation available with your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.