You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you?

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

ASSISTANT: Sure, please wait a second.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.