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:       Susan , Did you know the four ugliest women in ancient China ?  
 Person2:No , I only know four great beauties of China .  
 Person1:        There were some famous ugly women in history .  
 Person2:Yeah ? Were they famous because of the ugliness ?  
 Person1:        Though they were ugly , they had great virtue .  
 Person2:Then who were they ?  
 Person1:        Mo Mu , Thong Lichen , Meng Gang and Ran Nv . They were well respected .  
 Person2:It seems that the inner beauty is also important .  
 Person1:        Sometimes the inner beauty is more beautiful . 

formal