Very common occurence and easily dealt with. Not even uncommon for someone who needs a room at 10:00 AM to book for the night before. But, making certain that the property has this specifically noted is critical.
I can't believe that you won't be able to find a fluent English-speaker at a Paris Marriott, especially during regular business hours.
I would not call this a change at all, simply advising the property that airline schedule changes may mean that you arrive early in the AM, perhaps as late as 10 and want the room held.