You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Due to some reasons, I have to change my existing reservation.Can you please help me out?

ASSISTANT: Sure, can I know your name please?

USER: I am John Hernandez here.

ASSISTANT: John, can I know your new travel details please?

USER: The airport codes are from NV-LAS to NY-EWR. The planned dates are from 03/19 to 03/21.

ASSISTANT: Ok, wait a moment.

USER: Sure. make sure that the connection limit should be 1.

ASSISTANT: Sure. There is a flight for you as per your request, shall I proceed?

USER: Yes, proceed with my booking.

ASSISTANT: I have booked your ticket with flight number 1004 and price is 100.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us, have a safe journey.