Definition: If the emotion of happiness is present in the one of the dialogues of the conversation, then output Yes otherwise output No
Input: Hello , Miao Li , Where are you going ?  Hello , I am going to the store to buy some fruit .  Oh , Would you do me a favor ?  Yes ?  Please mail this letter for me on your way to the store .  Sure . Do you want it to be registered ?  Yes , I think so . There are some pictures in it . It would be a great pity if they were lost .  Yes , I will be glad to mail your letter .  Thanks .  you are welcome . 
Output:
Yes