You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Me and my friends have planned for trekking at Angel Island in Oakland, so I need to book a flight ticket to CA - OAK. Can you help me to book a ticket from Washington, DC - IAD?

ASSISTANT: Sure, could you please provide your travelling dates?

USER: Sure, I would like to start my journey on 08/19 and return on 08/21.

ASSISTANT: Ok, may I know your price limit?

USER: Sure, my price limit is 500.

ASSISTANT: Ok, there is a flight 1002 in Southwest airline matching your details with price 200. Shall I proceed?

USER: Ok, you can proceed for booking.

ASSISTANT: May I know your name to book your ticket?

USER: My name is Patricia Thomas.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Thank you for reaching us, have a safe journey.