Help me get her number

so yesterday i went to a local optical shop, and then there was only one girl alone, i asked about the frame nd all and give her my spectacles, and the way she was talking with me, laughing at my jokes, talking to me like im her friend ,doing lots of eye contact with smile, it really melt my heart. Then after 3 hours i came back again to pick up my spectacles, at that time the owner and his wife was also, i think she is the sister of the owner wife, but there were busy with other customer, so i was talking with her, we were laughing and smiling. Damm never had such a interaction with some stranger. Now I can't stop thinking about her, i will try to go again today at morning where she's alone only, i want to get her contact😭 what should i say to her? Please help me guyss....