For future reference, please use the Code Tags
For your script:
Problem #1 is the fact that your on text event requires the entry to END with como, not necessarily to start with it, which is what the first part of your IF lines requires.
Problem #2 is that the random number can be between 1 & 10 (inclusive), yet you only check for 6
Here's a suggestion for a corrected code
on 1:text:como:#:{
var %resp = $r(1,6)
if (%resp == 1) { .echo -a 07 Bienvenido al Canal }
elseif (%resp == 2) { .echo -a 07 bien y vos }
elseif (%resp == 3) { .echo -a 07 tu familia? }
elseif (%resp == 4) { .echo -a 07 gracias ,bien y vos }
elseif (%resp == 5) { .echo -a 07 te parto en ocho }
else .echo -a 07 cague
} 
