You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi,. May I assist you ?

USER: I am Sharon Adams, I want to visit Los angles to see Hollywood walk of fame with my father. Help us to book a flight ticket.

ASSISTANT: Please provide travelling date ?

USER: My journey start from Las Vegas, NV-LAS to CA-LAX on 11/18. I want a return ticket on 11/20. Please make sure there should be a direct flight.

ASSISTANT: Any price limit ?

USER: Yes, fare should be 1000.

ASSISTANT: I'm sorry there is no flight available.

USER: Thank you for the information.

ASSISTANT: Thanks.