Chop onion, and celery. Wash chicken and pat dry. Cut into bite size pieces. Boil 3 cups of water in a pan and add pasta and cook on medium heat till pasta is cooked well drain excess water and keep aside. Heat oil in pan and add onion and celery and sauté till onion is translucent. Add chicken and sauté till chicken is no more pink. Add beans, tomato puree, salt, chilly powder and 1 cup of water. Bring to boil add reduce heat and add corn flour little by little and cook till sauce is thickened. Serve pasta in two plates, pour chicken bean sauce over pasta. Sprinkle cheese and serve.