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:       Ben always appears rude to the people around him . 
 Person2:But he's really kind at heart . 
 Person1:        That's true . We can not judge people by appearance . 

informal