Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       Can I help you ?  
 Person2:I'd like to buy some Chinese-style cakes . Could you recommend me some ?  
 Person1:        Certainly . What about moon cake ? It's typical Chinese food .  
 Person2:Moon cakes ? What is that ?  
 Person1:        The moon cake is round and looks like the full moon . That's why it's called the moon cake and the moon cake symbolizes family reunion and harmony .  
 Person2:Sounds very interesting . I'll buy some to family people .  
 Person1:        All the moon cakes are generally classified into two styles , Cantonese style and Suzhou style .  
 Person2:What's the difference between these two styles ?  
 Person1:        The skin of Cantonese style cakes is soft and puffy with heavy stuffing while the skin of Suzhou style cakes is puffy filled with fragrant nuts .  
 Person2:Get me some of each .  
 Person1:        OK , here you are . 

informal