Coach Peter DeBoer was speechless as he walked into the Vegas Golden Knights’ dressing room on Monday after Game 5 of the NHL’s Western Conference finals. “I didn’t prepare something to say to them tonight because I just didn’t think we’d lose,” he said. Lose the Golden Knights did. Dallas Stars forward Denis Gurianov’s goal at 3 minutes, 36 seconds of overtime gave his team a 3-2, come-from-behind victory and eliminated the Golden Knights from the postseason. Dallas advanced to the Stanley Cup Final for the first time since 2000. “We all feel like this is a wasted opportunity,” said forward Reilly Smith, a Golden Knight from the team’s first season in 2017-18. “This is probably the best, most skilled team that I played on in my career. To win the Stanley Cup was our one goal. We didn’t want anything short of that. Definitely feel defeated.” Vegas entered the restarted NHL season with its eyes on the Cup.