well, probably one solution could be to use a trigger.
in your (local) script insert a line:
MyChatVariable true; publicvariable MyChatVariable
then set up a trigger and in its condition field type
MyChatVariable
so as soon the variable becomes true (done in your first script), the trigger will fire and execute the commands in the on activation field (probably start the chat script)
Now wait for about 24houres and you'll get around 5 ways to do it better than my way.