I am dieting but my weight is not loss and I am also drinking slimming coffee?

Fat vs Muscle. Losing weight can mean different things to different people. I prefer to call it changing your body composition. That is to say gaining more lean tissue (muscle) and losing fat. It needs to be tracked with special scales or other equipment. Losing inches is as important as weight, and in some cases even more important. Would need much more info about your weight, "diet", exercise, etc.