How does dedicated server have to do with Halo 5 MP? Does it have to do with the internet connection? If I am in Thailand… will it work? Will it be hard to find a match in Halo 5 if I am so far away from US server and finally, will I be able to find a match quick? Please answer my questions 
-Thank you, Beast
They’ll likely have at least two server clusters for each continent, so you won’t be connecting to a server in America. Even if they don’t have an Asia server planned, you’ll probably be able to connect to either the Russian or European ones.
I am sure you’ll be able to find matches pretty quick. I am from India and I find matches in MCC within one minute now. So considering the fact that the game will have dedicated servers and more importantly, it will work at launch…I don’t think you should worry too much about finding matches.
Moreover, didn’t you play the beta?We had very little problems, if any, in finding matches in it. So I am pretty sure the final version will be even better!