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What is the right way to make an approach to someone? - what is olimelt medicine for

What is the correct way to approach someone?
My question:
If you (accidentally go to a place very often, perhaps, the warehouse, supermarket, delicatessen, gym, etc.) and go find someone who works there, you have, but it is difficult to find an opportunity to some suggestions to make because it really does make a number of approaches to the work at the construction site. But can not give up and lose this opportunity.