You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Due to postponement of my exams, I want to change my existing reservation.

ASSISTANT: Sure, could you please provide your name to proceed further?

USER: I am Donald Gonzalez.

ASSISTANT: Ok, please wait for a while, let me check your reservation and revert to you.

USER: Sure.

ASSISTANT: Thanks for your time, we are glad to inform you that we have found a reservation with your name. Can I have your new reservation journey details to proceed?

USER: Ok. I want to start on 05/20 and ends on 05/22. And my source point is DFW and destinations is at ORD.

ASSISTANT: Can I have your preferred connections and price lilmit?

USER: Yes, I have 1 connection with price of 5000.

ASSISTANT: Ok, please wait a moment. Thanks for your time, we are pleased to inform you that we have found a flight of UA airline, flight number 1014 connections-1 and ticket fare-100. Shall I proceed to booking?

USER: Ok, you can Proceed.

ASSISTANT: Sure, your seat has been reserved.

USER: Thank you.

ASSISTANT: Thanks for reaching us, have a safe journey.