My connecting flight was AC614 and was at gate D38 at 2:16PM due to the fact both me and my wife run to gate as we was one of the first off filght AC614The gate was still showed as open when I got to the gate but was told we could not board as they had already given our seats away and boarding had completed. I was told we had been moved to flight AC616 and was given new boarding passes and $15 food credit as goodwill.