The appropriate way to greet someone you don't know very well can depend on cultural norms and the specific context in which you meet them. However, here are some general guidelines that are commonly followed:
Start with a friendly and polite greeting: A simple "Hello," "Hi," or "Good morning/afternoon/evening" is usually a safe way to start the conversation.
Use titles and last names: If you're in a formal or professional setting, it's generally best to use titles and last names until the other person invites you to use their first name. For example, you might say, "Hello, Mr. Smith," or "Good morning, Dr. Johnson."
Listen and observe: Pay attention to how the other person introduces themselves and how they refer to others. This can give you cues about their preferred style of address.
Follow their lead: If the person you're meeting introduces themselves with their first name only, it's likely an indication that they are comfortable being addressed that way. In such cases, you can reciprocate and address them by their first name.
Ask if unsure: If you're uncertain about how to address someone, it's perfectly acceptable to politely ask them what they prefer to be called. For instance, you could say, "I hope you don't mind me asking, but would you prefer to be called by your first name or Mr./Ms. Lastname?"
Be respectful: Regardless of whether you use first names or titles, be sure to maintain a respectful and friendly tone throughout the conversation.
Remember, some cultures and social settings may have specific customs or preferences regarding greetings and names, so it's essential to be mindful of these differences when meeting someone new. If you're in a professional or formal setting, it's generally safer to lean towards using titles and last names until you're given permission to use a more informal address.