You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am Melissa Smith want to attend a seminar at Phoenix, can you book a ticket with price under 200?

ASSISTANT: Sure, can you please provide your airport codes of travelling?

USER: Sure, I want to fly from PHL to PHX.

ASSISTANT: May I know your preferable journey dates to proceed further?

USER: Sure, my travelling dates will be 03/14 and 03/16.

ASSISTANT: Frontier airlines is available on this route with a ticket fare of 200, shall I book your ticket?

USER: Yes, proceed with my booking.

ASSISTANT: Your ticket is confirmed with flight number 1016.

USER: Thank you.

ASSISTANT: Thank you, have a safe journey.