You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Can you please help me in booking my flight ticket from DCA to PHX?

ASSISTANT: How can I help you? May I know your travelling dates?

USER: Sure, my trip dates are from 12/24 to 12/26.

ASSISTANT: Do you have connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: Is there any other specification?

USER: No.

ASSISTANT: May I know your name please?

USER: Myself Dorothy Young.

ASSISTANT: I am sorry no flights found on your route?

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.