I have found some of the sales assistants quite helpful. In Popular they have not only checked if the book I wanted was in store, but also provided me with how many copies were in the three nearest stores, if the store I was in did not have it.
Also a kid's clothing store in Paragon, called over to their Centrepoint branch right before closing time to try and secure a fairy outfit we were trying to get as a birthday present. Admittedly the Centrepoint store never answered their phone. But the people in Paragon were trying hard for us!
As a general comment I have found some of the Filipino/Filipina hospitality workers to be quite diligent at making sure you are attended to.
I hope this gets the ball rolling for others!