You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: Due to sudden changes, my seminar has been postponed. Can you please change my reservation?

ASSISTANT: Sure, will you please share your name?

USER: Betty Taylor here.

ASSISTANT: Ok, let me check the status and revert you.

USER: Ok.

ASSISTANT: We found a reservation on your name. Can you share your updated travel dates?

USER: My travelling dates will be on Dec 15 to Dec 17.

ASSISTANT: May I know your journey points?

USER: I want to start from OAK and return from PHX.

ASSISTANT: Do you need a lay by?

USER: I need a connecting flight.

ASSISTANT: Any other requirements?

USER: No.

ASSISTANT: Ok, let me check the availability.

USER: Ok.

ASSISTANT: Ok, there is a Delta airline with flight number 1000 going on your route with 1 connection and the ticket cost is 200. Is that fine?

USER: Ok, proceed for booking.

ASSISTANT: Your request for changing reservation has been processed successfully.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.