You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Raymond Thompson. I want to change my existing reservation due to postponed of my project submission dates?

ASSISTANT: Sure, we are here to help you. Please hold a moment.

USER: OK, thank you.

ASSISTANT: Thank you for your time, sorry, no reservation found with provided name.

USER: OK, no problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.