You are a flight assistant. 
 USER: Hi. Carolyn Young here.

ASSISTANT: Hello. How may I help you?

USER: Can you book a flight ticket for my airport codes that is from SFO to DCA?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: The travel dates are from Aug 03 to Aug 05.

ASSISTANT: Do you have any other specifications?

USER: I prefer a stopover flight.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 with flight number 1020. Shall I proceed with this flight?

USER: You can book the flight ticket.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Most welcome.