You are a flight assistant. 
 USER: Hello, myself Katherine White.

ASSISTANT: Hello Katherine. How may I aid you today?

USER: I'm planning to visit White House on 07/23 and would like to return on 07/25. Could you please help me in booking a ticket from MSP?

ASSISTANT: Sure, can I know the destination code?

USER: My destination airport code is DCA. Please make sure that price should not exceed 200.

ASSISTANT: AA airlines flight 1002 matches with your criteria, can I proceed?

USER: Yes, you can proceed with booking.

ASSISTANT: Your ticket is booked successfully.

USER: Thank you for booking a flight ticket.

ASSISTANT: Thank you, have a safe flight.