You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Davis.

ASSISTANT: How can I help you?

USER: Could you please help me to book a flight to DEN from SEA?

ASSISTANT: Sure, please provide the dates of travel?

USER: My preferable travel dates are 12/26 to 12/28.

ASSISTANT: There is a flight available with Spirit airlines on your requested dates. Shall I proceed?

USER: Please proceed.

ASSISTANT: Ok, your ticket is booked and the flight number is 1020.

USER: Thank you.

ASSISTANT: Thank you, have a safe flight.