You are a flight assistant. 
 USER: Hello. Brian Taylor here.

ASSISTANT: Hello. How can I help you Brian today?

USER: Due to sudden change in my planned locations of journey, I would like to change my reservation. Can you please help me out with changing of my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please hold on a moment, I will check your reservation status.

USER: Sure, take your time.

ASSISTANT: I have found your reservation. Can you please mention your travel dates for booking flight ticket?

USER: Sure, I am planning to go on 12/29 and please book my return ticket on 12/31.

ASSISTANT: May I know your preferable airport code names?

USER: Sure, I want to travel from LAS to ATL.

ASSISTANT: Ok, please hold on a moment.

USER: Ok, take your time to check.

ASSISTANT: I have found a flight in this route, connection limit of this airline is 1 and price 100. Is it ok for you?

USER: Yes, I am ok with this, you can proceed with booking.

ASSISTANT: Your reservation successfully changed, airline is UA and flight number is 1009.

USER: Thank you for your assistance.

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

USER: Most welcome.