You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment to check your details and I will get back to you with the status.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no reservation found on your name to do modification.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.