You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to attend a seminar at Washington, can you help me to book a flight ticket from LAS to DCA?

ASSISTANT: Sure, we are here to help you. Please help me with your travelling dates.

USER: My travel dates are Mar 26 and Mar 28.

ASSISTANT: Do you have any lay by in between journey?

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

ASSISTANT: Is there any other specifications for you?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Melissa Thompson.

ASSISTANT: We found a direct flight in Southwest airline with a fare of 100 which departs at 5:00 and return at 18:00. 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 1003.

USER: Thank you.

ASSISTANT: Thank you for choosing us.