Well, that you mean “no” and if you the French man still insists, don’t get mad right away if you, the foreign – possibly American – woman, say “no” chances are. He’s been trained to act that way by French girl, and he’s just thinking you’re playing difficult to get and/or you want persuading.
The ditto goes with “I don’t know” and “maybe”. I’ve pointed out that in a us woman’s mouth “I don’t know” often means “no” and “maybe” often means “yes”.