Atalanta's chances are better than Marseille's in this match, so I think they will be in the Europa League final this season. However, they should not underestimate Marseille at all, because Marseille is also very likely to give them a defeat and prevent them from being in the final.
One of them will most likely face Leverkusen in the final match, because Leverkusen are now 2 goals ahead on aggregate in the first leg at AS Roma headquarters, and now they will play in their own stadium and will get full support from the fans.
I will now focus more on the Leverkusen vs Roma match which was actually more interesting. Even though no goals were scored in the second leg, both teams made this match fierce. Although Leverkusen certainly made the most attacks and dominated the match. But Roma also made some good attacks at the start of this match.
Atalanta have already won the match and will have a chance to go to the final, but what will be put into consideration is that their opponent, Marselle, can still make it based on a miracle, but the fact is that Atalanta will win the game because this is a home game for them, and if they lose, it will not make any sense. But all the story should be cut short as Atalanta have already gotten an aggregate of 3-1, which directly means they will be in the finals.
Having focus on Bayer leverkusen and AS Roma is a good suggestion, but the reality and the game are not in the favor of AS Roma, so it will be very hard for them to make it to the final. If not for Bayer leverkusen, if the final is for AS Roma and Atalanta, definitely AS Roma will win the trophy, but for now, I don't think I still have hope for AS Roma to make it in this season.