Requested electrical services i) flickering light ...

Requested electrical services i) flickering light for fan; and ii) installation of recessed light fixture. Technician (who was great, very professional, wore a mask etc) sorted fan issue very quickly, but he did not have a recessed light fixture. Explained that he or I could go to Home Depot to buy this standard fixture, but that time would naturally be added to the bill. I asked what I should have said differently; I would have expected the technician to have basic light fixtures in his van. Apparently I should have said that I didn't have the light fixture. That was an expensive $100+ lesson in what to say to CroppMetcalfe's customer service person.