You are a flight assistant. 
 USER: Hello, I am Barbara Nelson.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, I will help you, may I know your travelling dates?

USER: My travel dates are 02/14 and 02/16.

ASSISTANT: May I know your airport codes?

USER: Airport codes are SEA-DCA.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There is a AA 1013 airline which matches your travelling dates. Shall I proceed with booking?

USER: Yes, you can proceed with booking.

ASSISTANT: Your booking has been confirmed on name of Barbara Nelson.

USER: Thanks for the assistance.

ASSISTANT: Thank you for opting us.