You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Paul Green.

ASSISTANT: How can I help you?

USER: Can you please help me in airline reservation from PHX to DCA?

ASSISTANT: May I know your desired travel dates please?

USER: My journey dates are, depart on Nov 19th and return back on Nov 21st.

ASSISTANT: May I know your preferred airlines?

USER: I am ok with any airlines.

ASSISTANT: Can I know your connection limit please?

USER: I need a connection in between journey.

ASSISTANT: There is a flight with connection limit 1 and fare 100, shall I proceed for booking?

USER: My depart time is in the evening and, I need a economy class. can you please recheck with these details?

ASSISTANT: Sorry to say, there is a no flight available.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.