You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Ronald Allen, planning to attend my cousin's wedding in Houston, could you please help me in booking my ticket.

ASSISTANT: Sure, could you please provide your airport codes and dates of traveling?

USER: Sure, my departure is from NV-LAS to TX-IAH,. And I would like to fly out on 06/30 and return back on 07/02, can you make sure that my price limit is 500.

ASSISTANT: Sure, please wait for a while, let me check the airlines availability and revert to you.

USER: OK.

ASSISTANT: Thanks for waiting, sorry, unfortunately no flight has found on that day.

USER: OK no issue. Thanks for your service.

ASSISTANT: you are welcome, thanks for your interest.