Definition: If the emotion of happiness is present in the one of the dialogues of the conversation, then output Yes otherwise output No
Input: What can I do for you ?  I'd like to buy some milk powder . What would you recommend ?  We have many kinds of different purpose . I wonder whom you are buying for ?  My son . He is two years old .  I see , sir . This one is very good .  Is it ?  You may rest assured . It sells well .  May I have a look at the introduction ?  Certainly . Here it is . 
Output:
Yes