You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can help you today?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: May I know your name please?

USER: I am Michael Lopez.

ASSISTANT: Thanks for your name, please wait.

USER: Ok.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.