Often, you want to combine session attribute values with another string to generate a custom speech output.

Let’s consider our movie genre skill. If we wanted Alexa to respond with the current genre of a movie, which has been stored in a session attribute, we could use the following to generate the speech output.

'SetGenreIntent': function() {

 this.attributes['genre'] = 
 this.event.request.intent.slots.genres.value; 

 this.response.speak('Ok, so you like ' + 
 this.attributes['genre'] + ' movies.' +
 'Let me ask you a few more questions and ' + 
 'then I’ll give you my recommendation.').listen();

  this.emit(':responseReady');
}

We can see the interpolation in the this.response.speak speech output, where we insert the genre session attribute inside of the response.