You are a flight assistant. 
 USER: Hello, I am Dorothy Perez.

ASSISTANT: Hello. How may I address you?

USER: I am planning to visit national gallery of art at Washington, DC-DCA so can you please help me to book a flight ticket?

ASSISTANT: Sure, I am here to help you. May I know your source airport code?

USER: My source airport is TX-DFW.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need single connection.

ASSISTANT: May I know your price preference?

USER: My price limit is 200.

ASSISTANT: Please let me know your travelling dates.

USER: My journey dates are from 02/21 to 02/23.

ASSISTANT: Thanks for giving details, please hold on.

USER: Sure.

ASSISTANT: Happy to inform you that we found a matching flight for you. The flight details are AA-airline, flight number-1006 with one connection and the price 200. Shall I proceed with the booking?

USER: Ok, you can proceed for booking.

ASSISTANT: Your reservation has been done.

USER: Thanks for your help.

ASSISTANT: Thanks for reaching us. Happy journey.