You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a flight ticket from IAD to CLT?

ASSISTANT: Sure, let me know your trip dates please?

USER: Thank you. I have planned my travel dates as Apr 21 and Apr 23.

ASSISTANT: May I know your connection limit?

USER: Sure, I am looking for single connecting flight.

ASSISTANT: Do you need any other preference?

USER: I would like to depart in evening time so please check with that.

ASSISTANT: Can I know your name please?

USER: Sure, myself Barbara Carter.

ASSISTANT: Spirit Airlines is providing connecting flight with the ticket fare of 500. Shall I proceed?

USER: That is fine, please proceed with booking.

ASSISTANT: Your ticket has been confirmed by flight number 1019 and an business class.

USER: Thank you for your help.

ASSISTANT: Thanks for choosing us.

USER: Most welcome.