You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I be your helping hand?

USER: Can you please help me in changing my existing reservation to Denver? As my meeting got postponed at Denver.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait.

ASSISTANT: May I know your name to find your existing reservation?

USER: My name is Kimberly Wright.

ASSISTANT: We have found a reservation on your name, please share your airport codes.

USER: My nearest airport codes of journey are from LAS to DEN.

ASSISTANT: May I know your new travelling dates?

USER: My planned dates of journey are from 05/02 to 05/04.

ASSISTANT: We have a connecting flight from Delta airline, number 1003 and the price is 100. Shall I confirm your ticket?

USER: Please reserve my ticket with this airlines.

ASSISTANT: Your economy class ticket is confirmed.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for choosing us as your travelling agent.