Chicken Tzatziki Pizza

Name: Chicken Tzatziki Pizza
Ingredients: 1 cup plain greek yogurt; ½ cup sour cream; 2 cloves garlic; 1 cucumber (peeled, cut in quarters and seeded); 1 tablespoon lemon juice; 1 tablespoon olive oil; 2 tablespoons fresh dill; kosher salt; 4 pieces Greek flatbread or pita breads; Tzatziki sauce; 2 cups shredded mozzarella cheese; 1 cup shredded chicken breast; ½ cup sliced kalamata olives; ⅓ cup sliced sun-dried tomatoes; 1 cup quartered artichoke hearts packed in water (drained); ⅓ cup feta cheese; oregano; fresh dill for garnish; red chili pepper flakes for garnish