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01cite10CalifJim12cite10 You are more likely to hear 11i10How may I help you?12i10 from a salesperson in a shop or department store. 12br10Yeah, it seems it's often used in those kind of "public situations"... Good morning sir, may I help you?02br
12blockquote
"May" is generally used for permission. May I go to the restroom? You may (are granted permission to) go to the restroom.
"Can" is to demonstrate the ability. You can go to the restroom by yourself.