When in doubt use first and last names and wait for the invitation of a preferred title or name.
You could also ask formally, "How should I address you?" This is a very formal question, which suggests you are speaking to a superior, compared to, "What's your name?" Which is very neutral.
Most situations are easy to read. If someone gives you their first name, or even if they don't the tone has been set. It can be hard to switch to a less formal tone, and five years later you realize you don't even know what that person's first name is.
ANNABELLE B-BAUMANN, Communication Coach
"Annabelle I've learned alot from you .....with your friendly art and your diversified lessons... it is never boring!!!" -Doris, BASF
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