You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need to change my existing reservation due to postpone of my document verification in office. Can you please help me out?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for accepting my request.

ASSISTANT: Can you share me your good name please?

USER: Myself Jeffrey Moore.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name to change.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for availing us.