You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what services are you expecting from us?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: To proceed for further process, we need your name.

USER: My name is Margaret Hall.

ASSISTANT: Ok, please allow me a few minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

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

ASSISTANT: Thank you for opting us.