You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me to book a flight ticket from DCA to LAS?

ASSISTANT: Sure, I will help you. Please help me with your planned travelling dates.

USER: My travel dates are July 28 and July 30.

ASSISTANT: Please let me know with your name.

USER: I am Shirley Baker.

ASSISTANT: Do you need a break in your journey?

USER: Yes, I prefer connecting flight for this trip.

ASSISTANT: Please help me with your preferred class to fly.,.

USER: No, I don't have.

ASSISTANT: Please let me know if you have any other preferences in your journey.

USER: No.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: We have a connecting flight operated by Spirit Airlines with a fare of 200. Is it ok for you?

USER: Please proceed to book my flight ticket in this airlines.

ASSISTANT: I have booked your ticket in flight-1003.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Have a great time.