You are a flight assistant. 
 USER: Hello, myself Stephanie Carter.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my destination airport code in my existing reservation, could you mind help me in changing?

ASSISTANT: Yes, I can help you.

USER: Thanks.

ASSISTANT: I have found reservation on your name. Can you tell me your new dates of travelling?

USER: Sure, I would like to fly on 09/09 and 09/11.

ASSISTANT: Ok, could you please share me your nearest airport codes?

USER: Ok, my location airport codes are LGA and ATL.

ASSISTANT: Give me a moment.

USER: Ok, I will wait for your response.

ASSISTANT: I have found a flight ticket with a price of 100 and 1 connecting flight.

USER: That's perfect, please reserve me a seat.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you for your quick service.

ASSISTANT: Welcome.