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 .
Output:
formal