You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Angela Gonzalez. Can you aid me in booking a connecting flight from Washington, DC - DCA?

ASSISTANT: Sure, let me know your landing point.

USER: My landing airport code is San Francisco, CA - SFO.

ASSISTANT: Ok, may I know when you planned to travel?

USER: 04/01 and 04/03 are my travelling dates.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we found a connecting flight with 1003 number and the fare is 300.

USER: Ok, please proceed for booking.

ASSISTANT: Ok, your ticket has been booked in Delta airlines.

USER: Thanks for booking my ticket.

ASSISTANT: Thank you for choosing us.