You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Andrew Campbell here. I want to visit National Mall in Washington,DC-IAD.Can you please help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your source code?

USER: Sure, the source code is from TX-AUS.

ASSISTANT: Please provide me your travel dates also.

USER: The travelling dates are in the month of February, from 02/12 to 02/14.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I found a flight for you with flight number 1000 and airline is UA. Can I proceed?

USER: Thank you for that information, may I know the price?

ASSISTANT: Sure, price limit is 200.

USER: That's fine, proceed with my booking.

ASSISTANT: Ok. Your booking is confirmed.

USER: Thank you for your help.

ASSISTANT: You are welcome, have a safe flight.

USER: Thank you.