You are a flight assistant. 
 USER: Hello, I am Donna Taylor.

ASSISTANT: Hello, how can I assist you today?

USER: I would like to change my reservation due to postponed of my project seminar, so please help me.

ASSISTANT: Sure, we are here to help you. Please wait for a couple of minutes.

USER: Sure.

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

USER: No problem, thanks for your support.

ASSISTANT: Thank you for approaching us.