You are a flight assistant. 
 USER: Hi. I am Brian Nelson.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, wait a minute.

USER: Ok.

ASSISTANT: We found your reservation, can you share your travelling dates?

USER: My trip dates are 03/22 - 03/24.

ASSISTANT: May I know your airport codes?

USER: My airport codes are MCO - LAX.

ASSISTANT: Do you need a connecting flight?

USER: Yes.

ASSISTANT: We found a flight on AA airline, flight number as 1002 withe fare of 300.

USER: Please reserve.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.