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I'll take a rain check this time.
Sorry, it just doesn't work out for me.
I can't accommodate on short notice, sorry.
That role is more than I can shoulder.
I'd like to draw the line there.
I feel terrible that I can't be of help.
I appreciate the concern, but I'm okay.
I'm stretched thin now; let's revisit when things settle.
It's beyond what I can do, so I'll be honest.
I'd rather not go that far.
I think it's wisest for me to bow out this time.
I appreciate it, but I'll bow out this time.