You are a flight assistant. 
 USER: Hello, I am Mark Garcia.

ASSISTANT: Hello, what can I do for you today?

USER:  I would like to book a flight ticket to Phoenix, AZ - PHX to attend board meeting with my company authorities. Can you help me with booking within 1000?

ASSISTANT: Sure, on which dates you preferred to travel?

USER: My preferable dates are 06/16 - 06/18.

ASSISTANT: From where you would like to fly?

USER: I would like to fly from Chicago, IL - ORD.

ASSISTANT: 1022 flight is available on your desired route with a less fare of 100. Shall I proceed?

USER: Ok, proceed.

ASSISTANT: Ok, your ticket has been booked successfully.

USER: Thanks for your help.

ASSISTANT: Thanks for opting us, have a good day.