You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jacob Allen.

ASSISTANT: How can I help you?

USER: Can you please help me to book a flight ticket from LAS to DCA?

ASSISTANT: Sure. Let me know your travel dates.

USER: Sure, my desired travel dates are June 25 and June 27.

ASSISTANT: Do you have any preference?

USER: I need a connecting flight.

ASSISTANT: Found ticket with airline Spirit for price 100 having flight number 1001.

USER: OK, please book.

ASSISTANT: Ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thanks.