You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Please book a flight ticket to reach my destination DCA with my family.

ASSISTANT: Sure, can you please share your travel dates?

USER: Sure, my travelling dates are Dec 13 and 15.

ASSISTANT: Could you please help me with the source airport code?

USER: Sure, my nearest boarding airport code is ATL.

ASSISTANT: May I know your connection limit?

USER: I need a connected flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: My depart time is morning.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Do you have airline preference?

USER: No.

ASSISTANT: I am sorry to inform you that there is no flight available at your request.

USER: Ok, thanks for your information.

ASSISTANT: May I know your name please?

USER: Sure, my name is Joshua Carter.

ASSISTANT: Sorry for the inconvenience. Thank you for contacting us.