Place one slice of thin baby Swiss cheese into each of the 4 whole wheat pita pockets and set aside.
In a small bowl, stir together 1/2 cup plain Greek yogurt and 1 teaspoon garlic salt until smooth; set aside.
In a medium bowl, gently combine the diced avocado, quartered cherry tomatoes, juice of half a lemon, and half of the chopped cilantro; set aside.
Heat 1 teaspoon extra virgin olive oil in a skillet over medium heat. Add the 1/2 pound shredded cooked rotisserie chicken and cook 3–4 minutes, stirring occasionally, until warmed through. Sprinkle with the remaining cilantro while cooking.
Remove the chicken from the heat. Divide the chicken evenly and place about 1/4 of it into each prepared pita pocket on top of the cheese.
Drizzle each pita with the yogurt mixture, then add a generous spoonful of the avocado-tomato mixture into each pocket.
Serve immediately, or optionally grill the filled pitas in a sandwich press or Foreman-style grill for about 2 minutes to warm and lightly toast.