This is one way of cycling through lines of text defined in an array.
dropbox.com/s/nepxo6gicsdbegn/CycleTextFromFile.c3p
The good thing of doing something like this, is that you don't need to modify the event sheet if you later decide you want to add more lines of dialog.
Even if you aren't familiar with the AJAX or Array plugins, the example is short enough to be able to go through the events one by one. The important bits are commented.
Of course this is just one way of doing it, it's the kind of thing that 10 different people would give you 10 different answers.