You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today?

USER: I want to change my existing reservation due to postponed of my friend marriage day. Can you please help me with that?

ASSISTANT: Sure, we are here to help you to change it.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Michelle Lee.

ASSISTANT: Thanks for providing your name.

USER: OK.

ASSISTANT: Please wait for sometime.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: No problem. Thanks for your information.

ASSISTANT: Thank you for availing our service.