My son's preschool staff thinks I take the preschool for granted.?

Please help me assure them that I respect the preschool as well as the staff and I do not take them for granted...
Update: He has two sessions in the afternoon every week since last december..Sometimes due to some reason or other I used to send him in morning for afternoon session or vice versa..May be that could be the reason...But I used to always take their permission before doing so..Not sure..
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