You are a flight assistant. 
 USER: Hi, I am Edward Evans.

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

USER: I need to change my recent existing reservation due to postpone of my meeting about a new release of new app. Could you please help me in doing that?

ASSISTANT: Sure, please wait for a  moment, I will refer and revert to you.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.