Today I went to a big event for Heineken. For the first time, I had the courage to talk to different women. The first one I approached I told her "before I get back to my friends, I was curious to know what's your tatoo about", she just answered and said "that's it" and left. The second time I talked to a women I was asking about good places in the city! she answered and after 5 min of talking she went back to her friends without any notice. The third women I talked too, I asked her also about what's good in the city! she answered and left.
I'm happy that I had the courage to go up and talk to them, however why all of them just leave just like this.. am I doing anything wrong ?
Hope you guys can help me

You didn't get along with them well enough you asked for a number, then?

Is that because they weren't interested, or because you were afraid to ask?

What'd you do wrong? Not get the numbers - if your goal was to pick them up.

Good that you had the courage to talk to them!
Next step is to do well in a conversation. Check Nick Sparks at 21 convention.
Than ask for her number: "It was nice talking to you, we should catch up later" If she agrees, take your phone and let her enter.

Maybe you're not making the conversation interesting/flirty enough and it's just like small talk with a stranger?

But 2 women isn't a lot. I think you need a bigger sample size (i.e. chat to 20 and see how well you do)

You didn't have any particular goal and were aimlessly talking to these women, wasting their time. They picked up on this after the first few minutes and decided to eject because it wasn't going anywhere. I can imagine how the conversation went "Hey can I ask you where X is?" she replies and you say something else that's unrelated to where you're going and don't have a proper conversation with the girl making it very weird and clear you're just talking to her for the sake of it.

What your end goal should be when starting is this: Be the one to eject. That's your goal and keep that as your goal until you're comfortable talking to random women.

For instance if you're asking for directions say "Sorry do you know this place? I'm trying to get there." She tells you and you can say something like "Do you mind telling me what it's like?" she'll tell you or say she doesn't know then you can eject unless she prompts you to stay "No but i've heard great things about it." It's that simple... after she replies to you after you asked what it's like you can related previous experiences to it depending on what she's said... "Oh, that sounds a lot like X. I might actually like it..." then after that you're going to have to make a decision to eject or be forward and show some interest "I kind of have to go now but you're quite interesting. How about we meet up for a drink later on?"

As Games said, the conversation is not going anywhere. You need a purpose. Set goals step by step. Make it your first goal to stay in a conversation for around 5 minutes. Then make it your goal to get a number, then to makeout, and finally to get laid.

You just seem to be approaching because you want to approach. After that, you're lost.