You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency.

USER: I am Barbara Lopez.

ASSISTANT: How can I guide you for today?

USER: Me and my friends want to travel Phoenix for hiking in Cave Creek Regional Park, so I want to book a ticket from  Washington.

ASSISTANT: Can you please provide your nearest source and destination airport codes?

USER: I am departing from Washington IAD airport and land in Phoenix PHX airport.

ASSISTANT: Could you please help me with your preferable journey dates?

USER: My departure date is on 07/17 and return on 07/19.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route.

USER: Take your time but revert me back with best flight available.

ASSISTANT: Sure. Here is a flight with fare of 100 and single halt in AA airlines. Are you ok with these flight details?

USER: I am ok with the flight details, please proceed for booking.

ASSISTANT: Your booking is confirmed with flight number 1023.

USER: Thank you for your help.

ASSISTANT: Thank you for availing us. Have a safe journey.