You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your good name, Please? How can I assist you for the day?

USER: I am Jerry Brown. My preponed  plan came into existance, can you please change my existing reservation please.

ASSISTANT: Sure. We found a reservation on Jerry Brown. Can you specify your airport codes, Please?

USER: Ok, my new journey details are from EWR to LGA.

ASSISTANT: May I know your travel dates, Please?

USER: I would like to fly from 04/19 to 04/21.

ASSISTANT: May I know, Do you have any other restrictions?

USER: My price should not exceed 1000.

ASSISTANT: Is there any restriction on connections limit?

USER: Yes 1 connection limit.

ASSISTANT: OK. We are very happy to inform you that, There is a flight available with airline:Delta having flight number:1007 and price:200 matching your requirements. Shall I proceed with the ticket booking?

USER: Ok, proceed.

ASSISTANT: Sure. Your ticket is booked.

USER: Thanks for your help.

ASSISTANT: Thank you, For choosing us to book your ticket.