You can make Alexa say a random phrase to the user that will vary each time the skill is invoked. This will give Alexa a more unpredictable, human behaviour.
For example, you can define a list of possible greetings:
var myRequest = ['hello','howdy','hi', 'good day'];
You pass in this array and the function will select and return one of the items at random.
this.emit(':tell', 'the welcome message is, ' + randomPhrase(myRequest) );
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