How do you get on first name terms with the bar staff?

I hate addressing bar staff as "Oi, you!" How do I get the secret info I need? At the moment I'm calling everyone Doris and I just get funny looks, especially fro the guys. Little help?

Dont ask me, I just work here.
Don't ask me, I just work here.
How do you get on first name terms with the bar staff?
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