app.component.html

<div class="text-center">
  <p>Haz click en el boton para lanzar el modal deseado</p>
  <p><button (click)="mostrarModalInfo()">Modal para informar</button></p>
  <p><button (click)="mostrarModalConf()">Modal de confirmacion</button></p>
</div>

<ng-template #myModalInfo let-modal>

  <div class="modal-content">
    <div class="modal-header">
      <h5 class="modal-title">Éxito</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close" (click)="modal.close()"> 
          <span aria-hidden="true">&times;</span>
        </button>
    </div>
    <div class="modal-body">
      ¡Modal mostrado correctamente!
    </div>
  </div>

</ng-template>

<ng-template #myModalConf let-modal>

  <div class="modal-content">
    <div class="modal-header">
      <h5 class="modal-title">Éxito</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close" (click)="modal.close('Cerrado desde la ventana')"> 
          <span aria-hidden="true">&times;</span>
        </button>
    </div>
    <div class="modal-body">
      ¿Quieres confirmar la informacion? (Mira el resultado en consola)
    </div>
    <div class="modal-footer">
      <button type="button" class="btn btn-secondary" data-dismiss="modal" (click)="modal.close('No')">No</button>
      <button type="button" class="btn btn-primary" (click)="modal.close('Si')">Si</button>
    </div>
  </div>

</ng-template>