the words that you use to greet people you know will depend on the relationship. if the relationship is an equal one,you will almost certainly use the first name and an informal salutation such as " Good morning", "How are you?",or " Nice to see you". With strangers, the greeting also as an introduction, so you announce your name ("I'm Mary Black") and follow up with an expression of polite pleasure ("It's good to meet you") This show friendly intent.