You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to visit San Francisco, will you help me in booking the flight ticket from DCA to SFO?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are Mar 21 and Mar 23.

ASSISTANT: Do you have any specifications?

USER: I need a flight with single connection.

ASSISTANT: May I know your name?

USER: Myself Elizabeth Lopez.

ASSISTANT: Ok, please wait a minute.

USER: Ok, I will wait.

ASSISTANT: We found an airline Southwest with flight 1013 having a fare 200 with direct flight. Shall I proceed?

USER: Sure, you can proceed with the booking.

ASSISTANT: Your booking has been processed.

USER: Thank you for helping me.

ASSISTANT: Thank you.