You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Last year we have visited San Francisco, CA - SFO but, it is incomplete again we have planned to visit remaining places. Can you help me to book a flight from DC - DCA?

ASSISTANT: Sure, Kindly mention your travel dates?

USER: I am interested to fly on 09/11 and return at 09/13.

ASSISTANT: Do you want have any connection limit in between the journey?

USER: I am looking for a connected flight.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: Ok, not a problem.

ASSISTANT: May I know your name?

USER: I am Brenda Baker.

ASSISTANT: Thanks for choosing us, have a good day.

USER: Thanks for the quick response.