If the customer made this request, but not because of an event the bank or settlement service provider had, then it's a changed circumstance.
My opinion: dates, odd days interest and escrows don't trigger a new GFE. The date info is in the terms and aren't a settlement fee issue. The odd interest and escrow are both unlimited tolerance, so it doesn't matter (to RESPA) if they are off.
You may want to inform your customer of these changes for customer service reasons, but it's not necessary for RESPA.