update operator speech

psGrammar/tasks/carrymyluggage/commands.jsgf

@@ -5,11 +5,11 @@ public <statement> = <command>;
 
 <robot> = (tobi | robot | tiago);
 
-<command> = [<robot>] ( <followMe> | <arrived> | <goAhead> ) [<robot>];
+<command> = [<robot>] ( <followMe> | <arrived> | <goBack> ) [<robot>];
 
-<goAhead> = ( go ahead ); 
+<goBack> = ( [thanks you can] go back [now] );
 
-<followMe> = ((follow | come with ) me [to the <place>]);
+<followMe> = [please] ((follow | come with ) me [to the <place>]);
 
 <arrived> = ((stop [(here | following me)]) | (wait here) | (we arrived [ at the <place>]) );