Let me offer a different spin.
If you regularly accept certain shops and/or your scheduler has come to know and even rely on you, then it may be a good idea to let them know. It helps to maintain that relationship that can be so very important.
If you are one of a million shoppers and there's no way the scheduler remembers you, then there's no point in letting them know.
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Mike T
Looking for shops in Western Canada
"Life is good because the alternative is forever "