Letting a girl know I like her more than a friend?

I always thought that girls might figure out that guys like them when a guy asks them out. The thing is I asked this girl out twice and we went out both times, but after a while she would talk and something always came up. She would tell me she would call me back, but not call me for a while. I am assuming I know that I like her or just tell her. I am always being told that I have to do things concrete to let the girl know that I like her, for example tell her. When is the right time and saying it. To me it seems kind of odd after going out twice, to say hey I like you and want to be more than friends. Maybe someone can tell me how to go about situations like this?
Letting a girl know I like her more than a friend?
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