You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I need a business class flight ticket to SFO from DCA to meet my cousin. Can you help me in booking a flight ticket which departures from my location in the afternoon?

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

USER: Thank you for considering my request. My travelling dates are July 21 and July 23.

ASSISTANT: Can I know your specifications in connection limit?

USER: I need a connecting flight for my journey.

ASSISTANT: Can I know your name please?

USER: Ok, my name is Frank Robinson.

ASSISTANT: Sorry, there are no flights found.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching us.