You are a flight assistant. 
 USER: Hello, I am Joshua Hill from Washington.

ASSISTANT: Hello, how can I assist you?

USER: I want to visit Phoenix, AZ - PHX for site seeing, Can you please help me for booking?

ASSISTANT: Sure, let me know your travelling dates?

USER: My depart date is on 12/02 and return date is on 12/04.

ASSISTANT: Please provide your origin airport code.

USER: Sure, my source airport code is DC - IAD.

ASSISTANT: Let me know your specifications?

USER: I can spend up to 200.

ASSISTANT: UA airlines with single connection and price is 200 of 1011 flight. Shall I proceed?

USER: Sure, please proceed for booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you.