Γεια σου Ιάκοβε
"Καλό απόγευμα" is a goodbye and not a hello greeting.
When you meet someone, you say "Καλησπέρα" to greet him (as a hello) and "καλό απόγευμα" when you leave him (as a goodbye).
Examples:
"Καλησπέρα Ιάκοβε, τι κάνεις;" = "Good evening, James, how are you?"
"Τα λέμε αύριο. Καλό απόγευμα!" = "See you tomorrow. Good afternoon!"
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.