You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Rachel Smith.

ASSISTANT: How can I help you now?

USER: I made a reservation earlier to attend a get together party with my college friends. Due to some issues in college it is postponed.

ASSISTANT: Ok.

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, I will help you. Please, wait a minute.

USER: Thank you. Sure.

ASSISTANT: Thanks for waiting, I am happy to inform you that, we found a reservation on your name. Can you please share your new journey dates?

USER: I want to travel on 09/14, and need to catch return flight on 09/16.

ASSISTANT: Please, provide the airport codes of your source and destination.

USER:  I need to leave from my nearest airport JFK to reach DFW.

ASSISTANT: Give me a minute, I will check and let you know the flight availability.

USER: Sure.

ASSISTANT: Thanks for your time, AA airline flight of economy class is available with fare 200 and single connection. Shall I reserve it for your journey?

USER: Proceed with the booking.

ASSISTANT: Your reservation has been changed and confirmed successfully with flight number 1015.

USER: Thanks for the help.

ASSISTANT: Thank you for availing us.