Are you workin?
As their greeting. If I'm answering my phone I'm not 'working', when I'm with a client I don't answer the phone. I guess he wants to know my availability that day, so I'll either say yes or no depending on whether I am available for a booking or not. I've not had an enquiry start out with these words, end up in a booking. They usually haven't read my website and are requiring something/someone different.