Having been in that situation once, what is standard protocol when you have the kid but not the parent? No one ever told me what to do. All I could think of to do was not to show I was panicking, act like it was nothing but a thing so the kid wouldn't panic, and herd her to Guest Services so her mother could be paged or so she would be where her mother would be sent if the mother asked another TM for help. I found the mother along the way thank goodness, though the kid got hit several times as they went straight for the exit so I felt that I handled things wrong.