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:       Sometimes you look like brains , and sometimes you are simple a Barbie Doll .  
 Person2:I don ’ t know whether I am a Barbie Doll or you are one .  
 Person1:        Maybe I am a Barbie Doll , but I won ’ t do Barbie Doll things .  
 Person2:Well , I am not going to flog a dead horse . Let get down to our brass tasks and tidy these things up . 

informal