You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please reserve a flight ticket from Washington to Phoenix?

ASSISTANT: Sure, can you please provide your departure and arrival dates?

USER: Thank you for accepting my request. The departure and arrival dates are Feb 19 and Feb 21.

ASSISTANT: Kindly mention your source airport code?

USER: The source airport code is IAD.

ASSISTANT: Do you need any preferred connections?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Do you have any other specifications to be met?

USER: No, thanks for asking.

ASSISTANT: Can I have your name to proceed?

USER: My name is Melissa Brown.

ASSISTANT: We found a direct flight of Frontier airlines, flight number-1000 class-economy and fare is 200. Shall I proceed with the booking?

USER: Yes, I am ok with the direct flight. Please proceed with the ticket booking.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for availing us.