This has happened twice to me - I am on the mission in Casablanca where…

This has happened twice to me - I am on the mission in Casablanca where you are asked to bring a dozen roses and a dozen tulips to the owner of the chocolate shop. But, even if I have the flowers, or more than a dozen of each or all flowers, the game never allows me to give them to the owner. So, I'm stuck....any suggestions?