Stylish ways to be able to keep in touch with nice ladies you meet in public

The other week I was in a local store. A very nice young lady who worked there said "Hi" to me as she was coming up the aisle. I said "Hi" back. I was in that aisle looking at some stuff for quite a while. A few minutes later she came back down the other end of the aisle, and placed both of her hands on my back. I didn't even know she was there until her hands were on me. She may have done this simply because I was unknowingly blocking the aisle. Or maybe she did it because she was attracted to me? I never understand how women think, so I wasn't sure what to make of that. Then a few minutes after that she was coming up the aisle the other way again with a customer following her. I saw her coming this time so I stepped up to the edge of the aisle so she'd have space to go by. She was far away when she saw me step up but she was watching me and immediately after I stepped up she said to me "Thank you so much".

After this I went to pay for my items and she was on the register so I lined up behind another customer. But then an old lady who worked there fubared my plans by opening the register next to the nice young lady and saying "I can help you over here". So I had to get served by her instead of the lady I wanted to serve me at the register. I had bought some cleaning supplies and then the old lady serving me said: "Someone is doing some cleaning". Then the nice lady at the other register said "I buy those all the time", referring to scrubbing pads I was buying. The nice lady was also talking to her own customer at her own register at the same time, and saying to him: "My goal is for everyone to leave here with a smile today. No one leaves until they smile." Then as her customer was leaving she told him "Happy Easter".

My purchase was done at that point too. I didn't know what to say at that point because it would have looked weird if I went back to the nice lady after buying my stuff just to say bye to her. Or shouting it across the counter to her. Maybe I should have done it anyways and not cared how weird it looked? But even saying bye isn't enough, I wanted a way to keep in touch with her and be her friend.

Upon reflecting on all this, it bothers me a lot that I didn't do something better in this situation to ensure I had a way to stay in touch with that nice lady. I don't even care if it's not romantic. I'm very shy in real life, so that just makes it even harder for me to say things to ladies I don' t know without sounding silly. But most of the time I don't even know what to say or do, like in the example above. I have had other situations like this which I've also fubared, and I'm sick of fubaring them.

I would greatly appreciate feedback of what exactly I should have done in this situation to be able to stay in touch with this nice lady and be her friend. Actually I really wanna go back there and rectify this situation, because I regret having messed it up, and i want to erase that regret. I would also greatly appreciate a solid plan I could use to go back there and hopefully find her working there again when I go, and this time find a way to stay in touch with her. If someone posts a good plan in this thread that a stylish man should use to rectify this situation, then I will use that plan.

I would also appreciate general advice on how to always keep in touch with any lady who initiates contact with me in public.

Please advise.

I wasn't looking for a one liner and I wasn't looking to do her either. I was just looking for a stylish way to keep in touch with her on a friendly basis at least. I like that complimenting her and giving her my number idea, although the only thing I don't like about that is if she would have wanted to call me after having my number, but loses it by accident, I'd never know that she never called me simply because she lost it.

In regards to the criticisms, it's not joke. The reason I signed up for this forum to learn from you stylish men so maybe your stylish ways might rub off on me and then I can finally stop being a loser. I want to change from a loser into a stylish man. By the way right now I'm not even the better-dressed, I'm very ignorant about how I dress and a total newbie to style so thats another thing that keeps my confidence down.