He said " Au revoir " to me - which I thought a little tactless.
His dad was leaving for work, and there was the usual kisses and waves and " say au revoir to Papa, S!
She disagreed, and bade au revoir to her favorite mosaic, the " unswept floor " in the Vatican.
Before opening the door, turn and find the shopkeeper/host/hostess and say au revoir madame/monsieur or merci madame/monsieur…au revoir!.