Hello. I am Robert  Collins.
Hello, how may I help you?
I need to book a flight ticket from LAX to DEN, Can you please help me for booking?
Sure, may I know your trip dates please?
I would like to travel on 05/11 to travel on 05/13.
Please wait for a while.
Sure.
Sorry, we regret to inform you that there is no flight available as per your request.
Ok, no problem. Thanks for your information.
Most welcome.