You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

USER: I am Ronald Thompson. I want to book a flight ticket with Depart date July 9th.

ASSISTANT: OK, may I know your origin and destination?

USER: I want to start my journey from Las Vegas, NV - LAS to Charlotte, NC - CLT with return date July 11th.

ASSISTANT: OK. may I know your connection and price limit?

USER: I don't want any connection between my journey and my price limit is 200.

ASSISTANT: OK, please wait a moment.

USER: OK.

ASSISTANT: Thanks for waiting. Sorry to say that no flight is found regarding your information.

USER: OK, Thank you for your service.

ASSISTANT: Thank you, for choosing us.