depends on what environment your entering.( office, party, meeting, church, on a date)...sometimes we fill like others should notice us and give us respectful hospitality. the truth is, life is busy so the office, party, even church where there is alot of activity some people misses seeing us and will not say anything or perhaps they do see us decides they will later on even if they forget to. Anyway, on a date when someone is expecting you. Well, I believe I should say hello first. Just to greet and show confidence in ourself. However, after greeting a person they should be gracious enough to respond friendly. If not, then seek to leave eary. their probably not worth your time anyway.