You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I am Raymond Robinson. I would like to change my existing reservation, could you please aid me in changing?

ASSISTANT: Sure. I have found your reservation, can you please share your departure and arrival day?

USER: My departure and arrival dates are Sept 16 and Sept 18.

ASSISTANT: Ok, may I know your location airport codes?

USER: My airport codes are ATL and LAX.

ASSISTANT: The AA airline with flight number 1028 is available having fare as 100 and connection as 2, is it ok for you?

USER: Do not proceed. I need a connecting flight.

ASSISTANT: The Frontier airline with flight number 1003 is available having fare as 200 and connection as 1, would you like me to book this flight ticket?

USER: You can proceed.

ASSISTANT: Ok, your reservation is confirmed.

USER: Thank you.

ASSISTANT: You are welcome, have a great day.