People don't just disappear, Dean. Other people just stop looking for them.
Read more Sam Winchester QuotesFrom: Supernatural
Castiel: The whore can only be killed by a true servant of heaven.Dean Winchester: Servant like...Castiel: Not you. Or me. Sam of course is an abomination. We'll have to find someone else.
Dean Winchester: So who named you Emanuel?Castiel: Bouncybabynames.com.Dean Winchester: Well, it's working for you.
Dean Winchester: Well, he puts the "ass" in "Cass," huh?Sam Winchester: He's definitely off.Dean Winchester: Off? He hasn't been right since he got back from purgatory. We still don't know how he got out of there.Sam Winchester: I don't know, Dean. If he's so sketchy, then why were you praying to him?Castiel: You know, I can hear you both. I am a celestial being.