Delphi - MessageDlg

uses
  Dialogs;

function MessageDlg(const Msg: string; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; HelpCtx: Longint; DefaultButton: TMsgDlgBtn): Integer; overload;

TMsgDlgType = (
  mtWarning,
  mtError,
  mtInformation,
  mtConfirmation,
  mtCustom
);

TMsgDlgBtn = (
  mbYes,
  mbNo,
  mbOK,
  mbCancel,
  mbAbort,
  mbRetry,
  mbIgnore,
  mbAll,
  mbNoToAll,
  mbYesToAll,
  mbHelp,
  mbClose
);

if MessageDlg('종료 할래?', mtConfirmation, [mbYes, mbNo], 0, mbYes) = mrYes then begin
  Close;
end;