You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ronald Phillips.

ASSISTANT: How can I help you?

USER: I want to change my existing reservation due to my exams dates were postponed. Can you help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please standby.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation on your name. Can you please share your new journey dates?

USER: Ok, my new journey dates are from 02/19 to 02/21.

ASSISTANT: Please help me with your airport codes.

USER: My airport codes are from ATL to DFW. Make sure that, my journey should contain 1 halt.

ASSISTANT: Ok, please give me a minute to check for the flight availability.

USER: Sure, take your time.

ASSISTANT: We are happy to inform you that there was a flight available with single connection and price 100.

USER: Proceed with my booking.

ASSISTANT: Ok. Your ticket was conformed with UA airline.

USER: Thank you for your quick response, you made my booking ease.

ASSISTANT: Thank you for opting us.