What’s the best way to start a conversation with a girl you have never met before?

seikatsx
Yesterday I walked past a girl on a street and thought she was really good looking and wanted to start a conversation but sadly, she hopped into a taxi 10 seconds after I had a thought of asking her for her number. Don’t want to lose my chance the next time, so what do you all think?
What’s the best way to start a conversation with a girl you have never met before?
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