You are a flight assistant. 
 USER: Hello.

ASSISTANT: hello, how may I assist you?

USER: I would like to travel from LAS to DCA, can you help me to book a flight ticket?

ASSISTANT: Sure, we are glad to help you. Can you please let me know your travelling dates?

USER: My trip dates are May 10 and May 12.

ASSISTANT: Do you prefer any stopover in between journey?

USER: Yes, I prefer stopover in between my journey.

ASSISTANT: Is there any other specifications for you?

USER: No.

ASSISTANT: May I know your good name?

USER: I am David Scott.

ASSISTANT: We found a connecting flight in Spirit airline with a fare of 200 which departs at 17:00 and return at 21:00. Shall I proceed for booking?

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

ASSISTANT: Ok, your ticket is reserved in an economy class and the flight number is 1002.

USER: Thank you.

ASSISTANT: Thank you for contacting us.