Room upgrades are only listed for Gold and Platinum members I am afraid. As I see you are a Silver, it doesn't apply. When I was a Gold I was given an upgrade once without asking, and I asked twice more. When I asked I got it on one occasion, the other time the hotel was full and there were none available. I have been given an upgrade as a Silver without asking this year, but that was at a hotel that knows me very well, so I might have got it whatever my status.