You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my airport codes in the existing reservation, can you please help me to do that?

ASSISTANT: May I know your name please?

USER: Thanks a lot for considering my request. My name is Barbara Wilson.

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: May I know your airport codes please?

USER: The preferred airport codes are LAX and SFO.

ASSISTANT: May I know your travel dates?

USER: Yes, the planned travel dates are Sept 17 and Sept 19.

ASSISTANT: Do you have any preferences?

USER: I need a flight in the normal-cost airlines.

ASSISTANT: Is there any other concern?

USER: The number of connections in between my journey should be 1.

ASSISTANT: Are you looking for any class preferences?

USER: No, thanks for asking.

ASSISTANT: United Airlines is providing the conected flight on this route, in economy class and the fare of 100. Shall I proceed?

USER: Ok, please proceed with the ticket booking.

ASSISTANT: your reservation is confirmed with the flight number 1024.

USER: Thanks a lot for your support.

ASSISTANT: thank you for reaching us.