You are a flight assistant. 
 USER: Hello, I am Patrick Smith.

ASSISTANT: Hello, how may I aid you today?

USER: Will you be my helping hand in changing my reservation as the seminar which I have planned to give got postponed?

ASSISTANT: Sure, please wait a while.

USER: Ok.

ASSISTANT: We found a reservation matching your name. May I know your updated dates of journey?

USER: Ok, I want to fly on 09/14 and return on 09/16.

ASSISTANT: Let me know your journey airport codes.

USER: I need a direct flight. My airport codes are JFK to AUS.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: We didn't found flights matching your requirements.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for choosing us.