I'm sorry I didn't pick up the {item} like you asked. I {forgot/didn't get to the store/decided it wasn't needed/miscommunicated/etc.}.
I'd be happy to swing by get and get {item} at {time}, if that works for you.
I apologize again. I shouldn't have {said I'd get the item/made that assumption/etc.}.
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Index of letter of apology templates
