You are a flight assistant. 
 USER: Hello, I am Ronald Harris.

ASSISTANT: Hello,. How can I amend you today?

USER: Please help me to book a direct flight ticket, As I want to visit and interact in the National Gallery of Art, with my clients.

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: When did you schedule your trip?

USER: My travelling dates are from 03/29 to 03/31.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from DC-DCA to CA-SFO.

ASSISTANT: Thank you for your details. There is a plane found with a direct flight with flight number 1019 of Southwest.

USER: Ok.

ASSISTANT: Shall I proceed?

USER: Please proceed.

ASSISTANT: Reservation is done.

USER: Thank you for the help.

ASSISTANT: Thank you.