We haven't heard of a golden body fly, but some kinds of flies do feed on pollen.  Of these, various species of hover flies are common.  Do the flies resemble the one seen in this photo:

https://durhammastergardeners.files.wordpress.com/2013/06/syrphidclose.jpg

If so, they are harmless and beneficial.  Larvae of some hover fly species feed on aphids.

If you are seeing a different kind of fly, please reply to this message and attach a sharp closeup photo of the insect.

Looks like normal fly but it's body very golden. My neighbor commented on it also, she had never seen a fly that color.  Unless the fly is reflecting the gold color from flower.

The flies in the photo might be green bottle flies (Lucilia sericata) or a closely related species.

Compare here:
http://www.pbase.com/tmurray74/image/142985763

http://www.fnanaturesearch.org/index.php?option=com_naturesearch&task=view&id=1062

The adult flies sometimes feed on nectar, but they and their larvae also subsist on carrion, excrement, etc.  Sanitation is the best way to control them.

Learn more here:

Summer Filth Flies
http://www.extension.umn.edu/garden/insects/find/summer-filth-flies/