Guild Wars 2

I participated in all 4 rounds of tournament but i didnt claim tickets for first 2 rounds does it mean that they are gone for good ?

I think you have one week from the completion of the week’s tournament to claim the tickets or they are gone forever.

Yes, they’re gone for good. You had to claim them during the following week or lose them forever.

How Do I Get Rewards?

To be eligible for rewards for any given matchup, you need only earn that match’s weekly World Contributor achievement. Then, all you have to do is talk with the Battle Historian NPC during the next week’s matchup to earn your rewards. It is important to note: You must claim your rewards in the week following the matchup in which they were earned. Rewards that are not claimed during the following week will be forfeited.

https://www.guildwars2.com/en/news/announcing-the-world-vs-world-fall-tournament-2014/