You are a flight assistant. 
 USER: Hi, I am William Lewis.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am planning to visit National Gallery of Art at Washington, can you help me with booking a flight ticket with price under 1000?

ASSISTANT: Sure, I am here to help you. Can you help me with your airport codes?

USER: Airport codes are DFW-DCA.

ASSISTANT: When you are willing to travel?

USER: I planning to travel on 05/04 and intend to return on 05/06.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: We found 1004 Hawaiian airlines with single connection with price 200. Shall I proceed with the booking?

USER: Ok, you can proceed with booking.

ASSISTANT: Your booking has been confirmed.

USER: Thanks for the assistance.

ASSISTANT: Thank you for reaching us.