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

ASSISTANT: Hello, how may I assist you today?

USER: I would like to book a flight ticket to Denver, to attend my brother's convocation. Could you help me in booking within the price of 500?

ASSISTANT: Sure, could you please share your airport locations?

USER: Sure, it is from PHL to DEN.

ASSISTANT: Ok, please specify your journey dates?

USER: I would like to fly out on 01/05 and return on 01/07.

ASSISTANT: Ok, please hold a moment, let me search a flight for you.

USER: Ok.

ASSISTANT: Thanks for your time, we are glad to notify you that we have found a direct flight of Delta airline, flight number-1005 and price limit is 100. Shall I proceed with the booking?

USER: Ok proceed with my booking.

ASSISTANT: Sure, your ticket has been reserved.

USER: Thanks for your service.

ASSISTANT: Thank you for opting us, have a great day ahead.