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:       Oh , my god . How can you stand living in such a messy dorm ?  
 Person2:Our place is spotlessly clean , compared with others .  
 Person1:        Have you even tried to clean it once since you moved in at the beginning of the semester ?  
 Person2:In fact , I just swept the floor three days ago .  
 Person1:        I think we need to restart the dormitory sanitation inspection system .  
 Person2:I bet nobody will care about it . 

informal