You are a flight assistant. 
 USER: Hi, I am Richard Mitchell.

ASSISTANT: Hello, how can I help you?

USER: I have heard that Twin peaks is the best to visit in San Francisco, CA - SFO. Can you please book me a ticket to San Francisco?

ASSISTANT: Sure, Could you please provide me your origin code?

USER: Sure, My origin is Washington, DC - IAD. My journey dates are on 06/13 to 06/15.

ASSISTANT: Let me know your price limit?

USER: My price limit is 200.

ASSISTANT: Please wait a moment, I will let you know the information.

USER: Sure.

ASSISTANT: We found a flight with Southwest airline of flight 1016 and price is 100. Shall I proceed for the booking?

USER: It's perfect, you can proceed.

ASSISTANT: Ok. Your ticket has been successful.

USER: Thanks for booking my ticket.

ASSISTANT: Thank you for choosing us.