Chicken fajita with guacamole and tzatziki sauce

Name: Chicken fajita with guacamole and tzatziki sauce
Ingredients: 3 chicken breast; 1 red bell pepper chopped into cubes; 150 gr cheddar cheese; 3 spring onions; 2 cloves of garlic; 100 gr sweet corn; 1 onion; 500 ml Greek yogurt; 3 small cucumber; dill, salt, pepper, balsamic vinegar and olive oil; juice of one lime; 1 avocado; lettuce according your taste; chili pepper, could be also the fresh one