how do you prefer people address you (Bill, Mr. Wurtz, Bill Wurtz, etc.)?
if there is no one else around, you shouldn't need to say a name because it should already be obvious that i am the one you are talking to. if there is another person in close proximity, then 'bill' should be fine. if there is another person named 'bill' near by then you might need to say 'bill wurtz'