You are a flight assistant. 
 USER: Hi, I am Amanda Harris.

ASSISTANT: Hello, How can I abet you at this moment?

USER: Please help me in changing my reservation as my brother's engagement has been postponed.

ASSISTANT: Sure, I am eager to help you. Pleas wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. We are sorry to say that, There is no reservation on your name to change it.

USER: It's ok, thank you for your information.

ASSISTANT: Thanks for your presence.