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:       I simply couldn ’ t help giving him the fish-eye when I knew all that . 
 Person2:But Ben is not a bad man . I know him from A to Z . 
 Person1:        However , he disappointed us very much this time . 
 Person2:I can understand that . But ... 

informal