Sometimes rather than explicitly choosing a path as in Conditional Lines, you want to select a random path to mix things up. Here's how you might do this:
Player: Hello
[random]
NPC: Hello!
[or]
NPC: Greetings!
[or]
NPC: Hey, I guess.
[endrandom]You begin a random block with a [random] line. The first block underneath this
is the first random option. Every time the [random] line is encountered
in the dialogue, an internal random roll will determine which option is picked.
Every time you want to introduce another random option, use an [or] line
to separate it. This will become an equally weighted option.
After the final random option of the group, end it with an [endrandom] line.
Indenting technically doesn't matter because the random/or/endrandom lines fully demarcate the groupings; but you will find it easier to follow if you match the indents.