Dr.Light: Zero... we meet again.
Zero: Ironic isn't it that the tests you set for X are instead being completed by me?
Dr.Light: Perhaps... In any case, please download this arm upgrade.
Zero: What does it do?
Dr.Light: (explanation of the upgrade)
Zero: I can tell you feel a lot rests on X's shoulders. Too much, perhaps.
Dr.Light: In him lies the possibility of my life's dream coming true, a world where humans and thinking machines can live together peacefully.
Zero: I... I don't think that will ever happen. They fear us far too much because of the Mavericks.
Dr.Light: I feared a time of crisis would come, and it did. I pray that X and you are able to help these Reploids.
Zero: I follow X, his goals are mine.
Dr.Light: A variant compatible with your system will be uploaded as well Zero. Please, continue to support X.
Zero: Good, Dr. Cain wasn't quite able to repair me to full functionality. I owe X my life, there is nothing in this world that could stop me helping X.
There's my 2 cent's on the dialogue.
EDIT: removed some redundant dialogue, expanded on some ideas.