You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Could you please help me to book a flight ticket from LAS to IAD?

ASSISTANT: Sure, I am here to help you with that, can I know your trip dates?

USER: I will start on May, 19 and return on May, 21.

ASSISTANT: Do you have any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: Cynthia Smith.

ASSISTANT: Spirit airlines is available with the price of 100 and connecting flight. Can I proceed to booking?

USER: Yes, please book.

ASSISTANT: Your ticket has been reserved with the flight- 1013.

USER: Thank you.

ASSISTANT: Thank you for reaching us.