Grilled Chicken Kebabs

Name: Grilled Chicken Kebabs
Ingredients: 1/2 cup plain yogurt; 1/2 cup olive oil; 4 cloves garlic; 2 teaspoons dried thyme; 2 teaspoons dried oregano; 1 teaspoon salt; 1 teaspoon black pepper; 1/4 teaspoon cayenne pepper; 4 boneless, skinless chicken breasts; 2 tablespoons chopped fresh basil; 3 tablespoons lemon juice; 2 red bell peppers; 1 large red onion; Dipping sauce:; 1 cup plain yogurt; 3 tablespoons olive oil; 2 tablespoons lemon juice; 1 clove garlic; 1 tablespoon minced fresh basil; 1 tablespoon minced fresh mint; 1/2 teaspoon salt; 1/4 teaspoon pepper; 1 cucumber