Good stuff mate, at least your getting field experience and getting the experience that girls are usually receptive to your approaches. 10 approaches for the day is good, I too did the same mission from rules of the game except I combined it with a compliment: "hey you look really stylish and can propably tell me where a good place to get clothes from is round here" well word it better than that but along those lines.
Its funny, the compliment totally sandbags them and they try and recompose themseleves and think of the reccomendation. Try it next time
Keep up the good work