Falafel burger

(Food processor Is required)
2 cans chickpeas, drained
One small red onion
Two cloves garlic
1/2 cup parsley
1 teaspoon cumin
1 teaspoon coriander
1/4 cup flour
Salt and pepper
3 cups vegetable oil for frying
One cup Greek yogurt, plain
One cup, finally, chopped cucumber
2 teaspoons dill
Buns
Lettuce
Tomato slice