You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Could you please help me with booking a flight ticket from DCA to PHX?

ASSISTANT: Can I know your preferred travel dates please?

USER: My preferable travel dates are from Mar 04 to Mar 06.

ASSISTANT: Do you have any specifications?

USER: I need a flight with connection limit 0.

ASSISTANT: May I know your name please?

USER: My name is Nancy Parker.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That's ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for the information.