
Originally Posted by
5jj
Or, as many of them have been trained to say these days, "How
may I help you?".

How may I help you? and How can I help you?; How can I serve you?; May I help you?; What Can I do for you?In what way can I serve you? (Usually said by store clerks and food service personnel. The first question is the most polite, and the last is the least polite.) Waiter: How can I help you? Sue: I'm not ready to order yet. Clerk: May I help you? Jane: I'm looking for a gift for my aunt. How may I help you? - Idioms - by the Free Dictionary, Thesaurus and Encyclopedia.
To be honest with you, I don’t understand why the word "May" has been underlined? Having checked the Free Dictionary and found that "How may I help you"? is the most polite question. So, apologize for being curious, but as you know that I do live in environment where English is rarely spoken. As a result, this forum is the only place where I can ask questions and get your insightful, definitive answers. Thank you for being generous and patient.