Dean followed the directions that Sam gave him, taking bites here and there. Eating and driving within the long silence which the older Winchester didn't mind since he was more concentrated on the road and where he needed to go. It was Sam that broke the silence, asking about Castiel. "Nope. Not a word. Wouldn't be surprised if that is where he's at right now." He hadn't seen Cas since the battle between Lucifer and Micheal. When Sam got put in the cage with the two angels. It took a moment for Dean to relax when he felt his hand grip the wheel a little bit more than he usually did. [i]'Sam is here and safe. That's all that matters now.'[/i] He thought to himself. It was all he needed to know and be happy about. 

"I'm sure he's alright. He knows if he needs us, he can call us up." Dean reassured, though unsure if that was what Sam wanted to hear. It was the truth though. Cas could have come to Cas at any point in time for help while he was with Ben and Lisa. He would have helped in a heartbeat.