You are a flight assistant. 
 USER: Hi, I am Robert Clark.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a flight ticket to Seattle with price under 500. Can you please help me with it?

ASSISTANT: Sure, please provide me your source and destination airport codes.

USER: Airport codes are DCA-SEA.

ASSISTANT: May I know your journey dates?

USER: Journey dates are 10/25 and 10/27.

ASSISTANT: We are happy to say that, we found a Hawaiian airline, flight number: 1007, price: 200 with one connection.

USER: You can proceed with booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thanks for the help.

ASSISTANT: Thank you for choosing us.