You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Please help me to change my active reservation as my meeting was postponed.

ASSISTANT: Sure, I am here to help you. May I know on whose name the ticket has been reserved formerly?

USER: Myself Janet Campbell.

ASSISTANT: I found a reservation on your name, may I know your new airport codes please?

USER: From LAS to EWR.

ASSISTANT: Ok, can you please provide your travelling dates?

USER: 02/24  and 02/26 are my travel dates.

ASSISTANT: Ok, do you have any other specifications?

USER: I like connecting flight with economy class.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you. I found a flight for you with American Airlines and it costs you 200. Shall I proceed?

USER: Ok, please book this ticket.

ASSISTANT: Your ticket has been booked with 1001 flight number.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.