You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to attend a Seminar in Charlotte. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are Feb 13 and Feb 15.

ASSISTANT: Can you please share your airport codes?

USER: My airport codes are DCA and CLT.

ASSISTANT: Is there any connection preference?

USER: I prefer single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Angela Miller.

ASSISTANT: Angela Miller, there are no flights available in your route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.