You are a flight assistant. 
 USER: Hello. This is Raymond Hill.

ASSISTANT: Hello, how can I help you?

USER: Could please help me to book a ticket from DEN to LAS.

ASSISTANT: Sure. On which dates you need booking?

USER: My preferable dates are 12/20 to 12/22. I need 1 connection flight under the price of 5000. Could you please check for it?

ASSISTANT: OK, please wait for a while.

USER: OK.

ASSISTANT: based on your request there is a flight having airline name as Spirit, flight number is 1011 ,price as 100.

USER: Please book this flight for me.

ASSISTANT: Sure, your ticket is booked.

USER: Thank you.