def clean_advance_reservation(text):
    """ The advance reservation field identifies whether or not advance
    reservations are required to use these facilities (day use areas). If there
    is not recorded answer (blank) we default to 'no reservation required'.
    Returns 'True' if reservation required, False otherwise. """

    text = text.lower()
    if text in ['yes']:
        return True
    if 'registration required' in text:
        return True
    if 'tour request form' in text:
        return True
    if 'call ahead' in text:
        return True
    return False