Girls, What is the best way to cold approach?


So im going to shoot my shot, towards this girl, i have been having eyecontact with.
We both eye each other frequently, and i once caught her looking in my direction and quickly glancing away
I only see her few times a week.
Last week i saw her for the first time and we had a lot of eyecontact, including that glance away
Then today, i saw her again and did a last "test", we again had eyecontact (its like quick eyecontact then look away from each other)
I dont know what to think of it, but i see it like this;
at least she noticed me from the prev week and didn't stray away from making eyecontact with me

Now, next time i see her i want to step up to her. She sat there 2 times, alone with another girl
So there's no real crowd, but what do i say to not make it creepy?
Like i want to keep it short

any advice
Girls, What is the best way to cold approach?
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