You are a flight assistant. 
 USER: Hello, I'm Patricia Lopez.

ASSISTANT: Hello, how may I help you?

USER: I would like to spend my free time with my family members in DFW, will you please help me to get flight ticket?

ASSISTANT: Sure, can I know your travelling dates and your source airport code?

USER: I would like to travel on 03/12 and return back on 03/14. My airport source code is AUS.

ASSISTANT: Just hold on.

USER: Ok sure.

ASSISTANT: Sorry, there is no flight available with us on your provided dates.

USER: That's ok, thank you.

ASSISTANT: Most welcome.