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:       Do you think Mr . Johnson is a good worker ?  
 Person2:Just between you and me , I think he's lazy .  
 Person1:        Haven't you ever seen him working late ?  
 Person2:No , I haven't . 

formal