US English does not conjugate formality into the verb the way some European languages do. You signal respect with titles, slower pacing, and soft openers. Get the default wrong and you sound either stiff in a San Francisco product meeting or careless at a U.S. Citizenship and Immigration Services (USCIS, the federal immigration agency) window.
Where do first names start on day one?
Tech, startups, and many creative agencies in the Bay Area, Seattle, Austin, and New York City usually introduce people by first name in Slack, email, and standups. After the first reply, "Hi FirstName" is the normal email greeting even with someone you have never met in person. That casual pattern is workplace culture, not a national rule. See English for work when you need role-level English, not just greeting style.
Law firms, hospitals, banks, and many federal offices keep Mr, Ms, Mx, or Dr plus last name longer. A physician is "Dr. Chen" until they say "Call me Alex." Judges, hearing officers, and most DMV clerks expect title and last name for the whole appointment. Landlords and property managers often stay formal on the lease walk-through and first repair tickets. When English is still hard at those desks, keep the title and write questions down; English bureaucracy with limited English covers interpreter habits without changing address etiquette.
When do sir, ma'am, and school titles still matter?
Customer service in much of the South, and with older staff almost anywhere, still uses sir and ma'am as ordinary courtesy. Coastal cities such as Los Angeles, Seattle, and Boston use those words less often in cafés and retail; a warm "thanks" and a clear "please" carry more weight than a forced "ma'am." Match the person in front of you rather than importing one national script.
At schools, stay formal with teachers and other parents until they invite a first name. Coaches often go first-name earlier on the sideline. Friendship circles follow the same cue system: Americans may sound open on first contact, then keep titles until a shared activity repeats; Making friends and Social life explain where first-name culture actually sticks.
Federal and diplomatic correspondence manuals still list Mr, Ms, and Dr as the written default when you do not know preference. State Department protocol notes also stress confirming titles before programs and place cards. You will rarely need those manuals as a mover, but they confirm that titles remain real tools in US English even when street chat feels casual: English in the United States.
Common misconceptions
Hearing first names in a California engineering stand-up does not mean USCIS officers, judges, or your child's teacher want the same tone. Another mistake is waiting for a verb change that never comes. English has no Sie/du flip; if you need more respect, lengthen the title and soften the request instead of searching for a conjugation.
Summary
Default to first names in US tech and many creative offices, and keep Mr, Ms, or Dr plus last name for law, medicine, finance, landlords, USCIS, courts, and DMV desks until someone offers a first name. Use sir and ma'am where Southern or older service culture still uses them, and treat politeness as titles, tone, and manners rather than a grammar switch.
Sources
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