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:       I don ’ t know how to deal with Jack . He is indeed a trouble maker . He has louse up my business several times .  
 Person2:You mean Lily ’ s boyfriend ?  
 Person1:        Yeah .  
 Person2:Well , he is a hard case . Everyone would feel headache about him . 

formal