I'm trying to do something like, for example, when the player speaks to a person, it will print "Nothing is said after that.", "Silence fills the air.", or "Nothing is replied.".

You can put a random number in a string variable using the $rand(...)$ function.

For example, set a numeric variable called "response" to "$rand(1; 3)$" to set the value 1, 2 or 3.

Then you can use a "select case" to print the appropriate message for %response%.