Unfortunately, you are not amongst the restaurant's regulars, nor do you have the celebrity status that assures that the best table is yours. One method is, of course, to make a reservation. Most all exquisite restaurants require it. When you arrive, an extremely generous tip to the maitre'd, host or hostess is the time-honored tradition, and can work. Another little known method is to make your reservation through the concierge of a respected hotel, even if you are not a guest there, or even if you are in your home town.
Many nice hotels send many nice restaurants a significant amount of business.
Therefore, a kind word in your favor from the concierge to the maitre 'd should have the desired effect. As a gesture of gratitude, and to ensure future assistance, send the concierge a thank-you and a gratuity. A third method, though one with possibly less chance of success, is to write for reservations on your company letterhead. It may imply a tone of importance and the promise of future business. Yet a fourth, and again, less guaranteed method is to have your secretary or assistant call the restaurant for the reservation.