I would like a diet plan to lose 15 pounds in 2-3 weeks?

So would I. However, that is not healthy or safe or even reasonable. What is the rush or the fire, you may be putting your nutrition at risk to try and do that. A safer weight loss would be a steady 1-2 pounds a week over a longer period of time. You don't want to deprive your body of nutrients, calories, vitamins and minerals.