Meme?

I was inviting someone to an event with me but, having wished to come previously, on finding out the date they now sent an apology:

Hi John,

. . . Inevitably I am someone else that day and so can’t join you –I’m really sorry about that.

I wonder whether this is something of a standard excuse for us when we meet God.  Sure, my name might be the same on Monday as Sunday; at the business conference as at the Christian conference.  But I'm someone else.