You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to attend a Seminar in Las Vegas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are June 25 and June 27.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are ATL and LAS.

ASSISTANT: Do you require any specifications?

USER: I need single connecting flight.

ASSISTANT: May I know your name?

USER: My name is Frank Hall.

ASSISTANT: There is a direct flight on United airline, flight number 1017 with the fare of 100.

USER: Please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.