You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Anthony Parker. I need to book a flight ticket to attend an business conference meeting at Las Vegas, Can you please help me for booking with direct flight?

ASSISTANT: Ok, may I know your travelling dates?

USER: I would like to travel on 01/14 and return on 01/16.

ASSISTANT: Can you please mention your travelling airport codes?

USER: My source point is LAX to LAS.

ASSISTANT: Do you have any other preference?

USER: Yes, I need price limit with in 500.

ASSISTANT: Sorry, no flights found on your route to reserve your ticket.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Most welcome.