You are a flight assistant. 
 USER: Hi, I am Ronald Williams.

ASSISTANT: Hello, we are gladly here at your service.

USER: I am planning to visit National mall In Washington DC-DCA, could you please help me in booking my flight ticket. My departure is from TX-AUS.

ASSISTANT: Sure, Can I have your dates of travelling to proceed?

USER: I would like to travel from 09/09 to 09/11, and my price limit is 1000, with single connection.

ASSISTANT: Sure, please wait for a while, let me search a flight for you.

USER: Ok.

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

USER: Ok, not an Issue. Thanks for your service.

ASSISTANT: Most welcome, thanks for your interest.