You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you at this moment?

USER: I want to change my reservation due to postponed of my Interview, so please help me in changing.

ASSISTANT: Sure, we are here to help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, I am Frank Carter.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: There is no active reservation found with your name to change it.

USER: No issues, thank you.

ASSISTANT: Thank you for contacting us, have a great day.