You are a flight assistant. 
 USER: Hello, I am Cynthia Hall.

ASSISTANT: Hello, how can I aid you?

USER: I want to visit Phoenix, AZ-PHX on 12/18 to enjoy thunder snow with my sister. Could you please help me in booking a plane ticket?

ASSISTANT: Sure, could you please provide your further details to proceed?

USER: Sure, I want to fly from Las Vegas, NV-LAS and return on 12/20.

ASSISTANT: Ok, please hold on, let me check with the airlines and revert to you.

USER: Sure.

ASSISTANT: Thanks for being patient, we are glad to inform you that we have found a flight of Delta airline, flight number-1016 connections-1 and price limit is 200. Shall I proceed to booking?

USER: You can proceed with this airline.

ASSISTANT: Sure, your reservation has been done.

USER: Thank you for your response.

ASSISTANT: Pleasure to serve you, have a safe journey.