You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jason Walker here.

ASSISTANT: Walker, how can I assist you today?

USER: I would like to visit MGM Grand Las Vegas with my friend. Could you book my ticket from ORD to LAS?

ASSISTANT: Sure, I will help you. May I know your trip dates?

USER: My trip dates are 03/25 and 03/27.

ASSISTANT: Ok, please wait for a moment.

USER: I need a direct flight.

ASSISTANT: Sure, let me check for the direct flight.

USER: Ok.

ASSISTANT: There is a direct flight available with Southwest airlines and the ticket costs you 100 only. Shall I book the ticket?

USER: Please confirm my ticket.

ASSISTANT: Your ticket is booked successfully and the flight number is 1017.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for choosing us.