One of my employees has come to me on a few different occasions complaining about the perfume of another employee on the shift that comes in to relieve mine. She arrives at work about 15 minutes early and is in the same room as the employee who is complaining. My employee says that the perfume gives him migraines. I have mentioned to the supervisor of the employee with the perfume that it is causing my employee to get headaches and migraines however nothing has changed. How should I proceed with this?