You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Can you book a flight ticket from DEN to DCA?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Nov, 15 and Nov, 17 are my travel dates.

ASSISTANT: Can I know your name please?

USER: Shirley Phillips.

ASSISTANT: Do you need any specifications?

USER: I need connecting flight.

ASSISTANT: Can I know your airline preference?

USER: I am comfortable with any airline service.

ASSISTANT: Do you have any time preference?

USER: No, thanks.

ASSISTANT: There is a flight with connection 1 and price 100 with flight number 1004, can I proceed?

USER: Please proceed.

ASSISTANT: Ok, your ticket has been booked with flight number 1004.

USER: Thank you.

ASSISTANT: Thank you for reaching us.