You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Wright here.

ASSISTANT: How can I assist you?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, I am glad to help you. Please wait a moment.

USER: Sure, take your own time.

ASSISTANT: Karen, I found your reservation. Please let me know your airport codes.

USER: Sure, my respective source and destination airport codes are JFK and DEN.

ASSISTANT: Can you please share your planned journey dates?

USER: My new departure and return travel dates are 08/13 and 08/15.

ASSISTANT: Please hold on a moment, I will check he availability of flights.

USER: Sure, take your own time.

ASSISTANT: I found an economy class ticket in AA airlines with price 100. Can I book your ticket?

USER: That's fine for me, you can proceed for booking the ticket.

ASSISTANT: Ok, your booking is confirmed with flight number 1025.

USER: Thank you so much for your help.

ASSISTANT: Thank you for reaching us, have a nice day.