She's the perfect candidate for the job, but I need to confirm her 'availability'. [=I need to make sure she is available]
The woman who answered the phone said, “I'm sorry, but Mr. Adams is not 'available' right now. May I take a message?”
He wanted to ask her on a date, but wasn't sure if she was 'available'. [='single']
(..) He set up the whole fucking job and popped Kennefick. You do not want to miss it if Costello takes a dump. We'd miss less if you made your informants available to us and the Bureau. Without asking for too many details, do you have anyone in with Costello now? Maybe. Maybe not. Maybe fuck yourself. (..)2006 The Departed