Alright, I'm trying to develop my game and really look at the good and bad sides of each interaction I have with a girl I'm interested in.

Approaching is going quite well since I'm traveling, I find it easy to come up with a conversation starting.

My problem is the next step. I can find subjects to talk about, but it looks like the girls lose interest fairly quickly.

A recent example is a girl I saw eye fucking me from a hostel of a friend. I didn't approach there since we had to go. After like an hour I saw her walking with a friend and took my friend and started talking to then. Very quickly things look great and we were sitting at a table talking about our trips and lives. As I said, things faded away after a few minutes and it seems that she lost the interest she had. At the beginning she was all smiley and happy and then turned a little cold, and I'm sure it's not a shit test from her side.

It happened more then once, what should I do to improve this stage? Any tools to keep in mind?