What phrases would you use if you made a phone call?
Dzień dobry, Halo, Cześć, Witaj.
In English not Polish.
Some suggestions of what you might say:-
Hallo! Who's calling? Hold the line please. I'll put you through.
Is (Mary) there? Can I speak to her? Please tell her I called (or phoned).
Dzień dobry, Halo, Cześć, Witaj. You need to write in English not Polish You could say:- Hello, can I speak to Ann please. OR Can I make an appointment to see the Doctor please.