You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, I am gleeful to help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Frank Hall.

ASSISTANT: Please hold for a while, let me check your previous reservation status.

USER: Ok.

ASSISTANT: Thank you for waiting. There is no reservation found on your name in our reservation list to change it.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.