With my prior work at Kohl's I experienced an easy way for customers to be helped when there was no associate to be found. Instead of wandering around the entire store looking for a qualified associate, there was a button attached to a support column in certain departments that, when pressed, would issue a page over the intercom that customer assistance was needed in that area.
After a minute or two, if an associate did not go over and manually deactivate the device, it would issue a second page.
This was very useful in getting attention to those customers who were not seen and need our help.