You are a flight assistant. 
 USER: Hi, I am Matthew Adams.

ASSISTANT: Hello. How may I support you today?

USER: Can you please help me with booking a flight ticket from Washington with price under 500?

ASSISTANT: Sure, we are mirthful to help you.

USER: Thank you.

ASSISTANT: Do you need a lay by in between your journey?

USER: Yes, I need a lay by in between the journey.

ASSISTANT: Please share your source and destination points.

USER: Its a round trip and airport code is DCA.

ASSISTANT: May I know your planned travelling dates to proceed further?

USER: My travel dates are 06/26 and 06/28.

ASSISTANT: Ok, please wait a moment I will search best flight for you.

USER: Ok.

ASSISTANT: Thank you for waiting, we found an UA airline matching your essential details with single connection and the fare 100.

USER: You can proceed with booking.

ASSISTANT: Your seat has been reserved with the flight number-1006.

USER: Thanks for the help.

ASSISTANT: Thank you for availing us.