You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you today?

USER: I am Jeffrey Wilson. I want to change my existing reservation due to postponed of my project submission dates. Can you please help me with this?

ASSISTANT: Sure, please wait for a moment.

USER: OK.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: OK, not an issue. Thanks for your information.

ASSISTANT: Thank you for opting us.