You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I have to change the destination airport code in the previous ticket because the planned trip is changed due to some issues. Can you please help me to change the details?

ASSISTANT: Sure, I mirthful  to help you with that changing reservation. Please hold for a while.

USER: Thank you for considering my request.

ASSISTANT: I have found your previous reservation with your name. Can I know your new preferable airport codes?

USER: Oh! That's great. My preferable airport codes are DFW and DEN.

ASSISTANT: May I know your new travelling dates, please?

USER: I would like to travel on the dates of 08/21 and 08/23.

ASSISTANT: Spirit airlines are providing a flight with connection 1 and the ticket price is 100. Shall I proceed?

USER: Yes, please book the flight ticket with the name Shirley Thompson.

ASSISTANT: Your booking is confirmed successfully with the flight-1012.

USER: Thank you so much for your help in booking the flight ticket.

ASSISTANT: Thank you for approaching our agency, have a safe journey.