You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to celebrate my sister birthday can you please help me booking a flight ticket?

ASSISTANT: Sure, we are euphoric to help you.

USER: Thank you.

ASSISTANT: May I know your trip dates?

USER: My travelling dates are from 04/21 to 04/23.

ASSISTANT: Do you have any restrictions on price?

USER: I can pay up to 500.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from Las Vegas, LAS to Washington DCA.

ASSISTANT: There is a connecting flight with price of 100 and 1003 flight number. Shall I proceed?

USER: Please proceed with the booking.

ASSISTANT: To reserve your ticket, may I know your name please?

USER: I am Nicole Jackson.

ASSISTANT: Your booking has been confirmed with Southwest airline.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for connecting with us.