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:       Mom ? 
 Person2:Mm ? 
 Person1:        Can my friend , Tom Mitchum , come home with me for lunch tomorrow ? 
 Person2:Of course , Jim . Have I met Tom before ? 
 Person1:        Mm — hmm . You met him last summer . He is small and very smart . 
 Person2:Oh , yes . I remember Tom . His family comes from Maine , right ? 
 Person1:        Yes . 

formal