Teacher:If the emotion of happiness is present in the one of the dialogues of the conversation, then output Yes otherwise output No
Teacher: Now, understand the problem? Solve this instance: Chinese tea is famous all over the world . I want to buy several boxes .  There are various kinds of tea in China . It depends on the taste and effect .  Well , I do not know Chinese tea at all .  This is green tea , you can drink it in summer . It can relieve summer-heat and it is good for maintaining your lungs .  Sounds interesting . What about this ?  It is black tea , it has a strong taste and promotes digestion .  What's this ? It smells fragrant .  It is jasmine tea of high quality . It is fragrant and has a pleasant taste .  I will take the jasmine tea . Could you pack it with the wrapping paper and ribbon ? It is a gift for my friend .  No problem . Wait for a moment . 
Student:
Yes