You are a flight assistant. 
 USER: Hi, I am Shirley Martinez.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me with booking a flight ticket from DFW to DCA?

ASSISTANT: Sure, please provide your travel dates.

USER: Travel dates are 12/15 and 12/17.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: I would like to return at afternoon.

ASSISTANT: Flight-1004 is available in Southwest airlines with single connection and the flight fare is 100. Can I proceed?

USER: You can proceed with booking.

ASSISTANT: Your booking is confirmed.

USER: Thanks for the help.

ASSISTANT: Thank you for reaching us.