Las Vegas Mayor Oscar B. Goodman contacted the team this week about the possibility of beginning talks that could end with relocating to the glitzy gambling and entertainment mecca. The Chargers responded with a letter informing Goodman that their lease with San Diego prohibits them from talking with other cities until Jan. 1. Goodman said yesterday that he is not deterred. ?Las Vegas is the fastest-growing city in the U.S.,? the self-described ?happiest mayor in America? said in a phone interview. ?A new person moves here every six minutes. A new house is finished every 20 minutes. I'm thirsting for a major-league team. After January 1, I'll see whether the Chargers want to talk business.?