I'm 22 years old and my weight is 67 kg and height 172 cm i wish i could lose 3 kg in 5 to 7 days and 7 kg for a period of 14 days i tried various diets go to the gym every day for the past month but no result my blood group is b + and i'm a flight attend

Too fast: You are trying to lose too much weight in too little a time and it is not good for your health. You know that you need to reduce your intake and increase physical activity/exercise. Start by reducing you intake to half of what you usually eat. Keeping a diary of your intake will help in showing that you eat more than you think you do. Blood group is not relevant.