You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I assist you?

USER: Could you please book a ticket from Washington DC-DCA to San Francisco, CA-SFO.

ASSISTANT: Sure, I will help you. Can you please provide me your travel dates?

USER: Departure date is 08/19 and 08/21 is return date.

ASSISTANT: Ok, may I know your name?

USER: I am Debra Carter.

ASSISTANT: There is a flight with economy class available in Southwest airlines with single connection and the ticket fare is 100 only. Shall I book the ticket for you?

USER: Please book direct flight.

ASSISTANT: Sorry, no direct flight is available on your preferred dates. Are you comfortable with single connection flight?

USER: No. Thanks.

ASSISTANT: You are welcome.