Hey Kelly,
Welcome to the site. Your request could be a toughy. Personally I think the first thing you should try is to recall who the person was and try to contact them directly. If you can't do that,you can try to trace the cars whereabouts, Do you happen to recall the vin or the plate number that used to be on it? Some state dmv's are cool about looking that stuff up for you,N.Y. Does not appear to be one,at least not any of the branches I've ever been to . That said you're in an area where the dmv employees might actually be civil and helpful. So if you have the vin# you could try to head to your local dmv and see if they can assist you.
This can be tricky but I've also heard stories where people were able to find some info via friends and family in law enforcement.I believe they have ways of tracking down vin/last known license plate addresses.I'm not saying to take this route as I have heard this can get officers in trouble.
That said,Happy hunting.