Waffle House

I went in to waffle house # 643 on May 13 @ around 6 o clock pm. and saw that the cook left the premises while the young server who is a minor was there alone. She was cooking and waiting in customers the cook said he would call the store in 5 min. Not sure how long he was leaving for just don't think it is safe or fair to leave a 16 year old young lady there alone. Please address this matter