dont think .....just do it
social settings are dynamic...once the girl may be with her friends , at other times not....
go with the flow of situation , instead of finding an ideal one....
i would go for something like this:
Mindset : Completely enjoy myself
Hi, (situational opener) (commenting about music , food , etc)
Dont think what to say next. Listen to her, you will automatically get something to talk about
This is my personal suggestion. Post your FR for sure.