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:       What colour is her hair ?  
 Person2:Oh , blonde , she's very blonde ... quite short hair ...  
 Person1:        What , curly ?  
 Person2:No , not at all . Very straight . Her hair comes down like this ... just over the ears .  
 Person1:        Does she wear glasses ?  
 Person2:No ... no . I think you're thinking of someone else .  
 Person1:        No . I'm sure I know her .  
 Person2:Er ... what else can I tell you ? Er ... she's got ... er a ... round face , a very round face , and a very big mouth , sort of wide mouth , when she laughs , her face is all mouth .  
 Person1:        Ah ... No , I can't place her . 

formal