Dean and Sam were currently dead and travelling through heaven to get to an angel called Joshua. They were now in a memory with Dean's girlfriend. She died before Sam met her and she was Dean's one true love

Sam: "Dean, hurry up."

Dean: "just give me a minute" he mumbled as he she served him dinner, his favourite

Sam: "De-" Sam tried to speak again

Dean: "Please just a few more minutes" he looked up at Sam, his eyes pained