You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: Debra Clark is my name.

ASSISTANT: How may I assist you today?

USER: My project submission date has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, wait a while. I will check your particulars and revert you.

USER: Ok.

ASSISTANT: We did not find any reservation on your name to change as per your request.

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

ASSISTANT: Thanks for contacting us, have a nice day.