Gap in drywall ceiling between hood & drywall

Hi. My hood was installed to concrete ceiling prior to installing teh drywall frame & doing drywall sheets.. The drywall guys had to cut a gap in the ceiling so as to fit the drywall sheet would fit.. no i have a small gap all the way around the hood which does not look very nice at all.. can anyone help with this any suggestions how i can cover / fill the gap please

Thanks

Ryan