//If the conversation has not ended, display the following line but the conversation ends.
 private void AdvanceConversation()
 {
     //If there is a question
     if (conversation.question != null)
     {
         //And it´s not started, start it
         if (!questionController.QuestionStarted)
         {
             questionController.Change(conversation.question);
             speakerUILeft.Hide();
             speakerUIRight.Hide();
         }
     }
     //If there is a new conversation
     else if (conversation.nextConversation != null)
     {
         ChangeConversation(actualConversation.nextConversation);
     }
     //Delete this conversation
     else
     {
         EndConversation();
     }
 }