Combine the cucumbers, green onions, melon, chile, celery, vinegar, herbs, a drizzle of olive oil, and salt in a large bowl (the cucumbers will give off a lot of juice). Put the bowl in a large pot of ice water to chill for 30 minutes. In another bowl, combine the yogurt, a 2-count of olive oil, a squeeze of lemon, the parsley, and refrigerate. To serve, spoon the soup into bowls.