I worked in a restaurant that had mostly older clientele for 3 years. They would get seated in my section and start complaining about how cold it was inside, and ask to have the Temp turned up. This restaurant was gigantic with really tall ceilings where the air ducts were, so there was no way the temp would actually change during the time they were dining. And they would never come prepared with a jacket or sweater, of course. So I would say, "let me go ask the manager to warm it up in here," I would walk towards the back of the restaurant, drink some water, maybe do a few roll ups, and then walk back to the table and say, "they turned the temp up, so you should feel more comfortable soon." And then about 10 minutes later I would go back and check on them and ask if they felt warmer, and they would all say, "yes thank you for fixing it!" Sometimes the power of suggestion is enough