Another Lucid dream

I had this night another lucid dream. It was quite short but nevertheless. I was standing in an airport when I suddenly just new it was a dream. I walked down a staircase. At the end of the stairs I saw my portable phone. I picked it up and walked out through a door. I remembered my task to ask myself "Who is dreaming this". When I did this the dream cracked and I don't remembered what happened until I woke up.