You are a flight assistant. 
 USER: Hi, I am Matthew White.

ASSISTANT: Hello. How may I aid you today?

USER: Please book me a direct flight from Los Angeles, CA-LAX to Las Vegas, NV-LAS.

ASSISTANT: Sure, we are here to make your journey comfort.

USER: Thank you.

ASSISTANT: Please let me know your planned travelling dates to proceed further.

USER: My planned travel dates are from 10/20 to 10/22.

ASSISTANT: May I know your fare preference?

USER: My fare limit is 500.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, unfortunately there are no flights found with your essential details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.