Well you can't control so much whether they will ask for something from the silo or the barn. But if it is the silo items they are requesting you can sort of "control" that.
They either ask for the 2 items you have most of or the item you have 0 of. You want to avoid them asking for the silo item you have 0 of so to avoid that make sure you have at least 1 apple, 1 cherry, 1 coffee bean, 1 blackberry and so on. Also you should have at least one of each crop.
Here are a few pics of my silo inventory. In my case if the visitors ask for silo stuff they will always ask for wheat and corn. However in my case if they want my corn or a lot of my wheat I shouldn't sell it immediately but grow extra first. They will wait around if you tell them to wait. The reason for that is that if they want half my corn and I sell it my corn will no longer be my number 2 and they will ask for carrots. I want to sell the 2 fastest growing crops to them.
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