def noao_section_keyword(bbox, flipx=False, flipy=False):
    """
    Convert bounding boxes into NOAO section keywords.

    Parameters
    ----------
    bbox : lsst.geom.Box2I
        Bounding box.
    flipx : bool
        Flag to indicate that data should be flipped in the x-direction.
    flipy : bool
        Flag to indicate that data should be flipped in the y-direction.
    """
    xmin, xmax = bbox.getMinX()+1, bbox.getMaxX()+1
    ymin, ymax = bbox.getMinY()+1, bbox.getMaxY()+1
    if flipx:
        xmin, xmax = xmax, xmin
    if flipy:
        ymin, ymax = ymax, ymin
    return '[%i:%i,%i:%i]' % (xmin, xmax, ymin, ymax)