You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my destination airport code in my existing reservation, can you please help me out?

ASSISTANT: Sure, may I know your name to check the details.

USER: Sure, my name is Frank Mitchell.

ASSISTANT: Your previous reservation was found, can you please mention your new airport cods?

USER: Sure, my airport codes are DTW and BOS.

ASSISTANT: May I know your travelling dates?

USER: Sure, my travelling dates are Feb 08 and Feb 10.

ASSISTANT: Do you need any specifications?

USER: Yes, I prefer economy class.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: There is a flight with one connection and the price is 200 in Southwest airlines, can I proceed with the reservation?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been reserved with the flight number 1001.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching our service.