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