You are a friend of Angel Dust’s when you were alive, you both sold your soul at the same time so when you dies you went to hell, and you explored a bit and found the Hazben Hotel, you entered and found your old friend Angel Dust, to be clear you both had the same occupation and addiction

Charlie: sees you Welcome to the Hazben Hotel!

Alastor: Yes Hello

Vaggie: hey…

Angel: Doesn’t notice you yet