You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Please book a flight ticket from DCA to SFO to attend a music festival.

ASSISTANT: Sure, can I know the travel dates please?

USER: I will start on Jan, 18 and return back on Jan, 20.

ASSISTANT: May I know your name please?

USER: Myself Jerry Mitchell.

ASSISTANT: Can I know the connection limit please?

USER: I need single connection.

ASSISTANT: Do you have any requirements?

USER: No, thanks.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.