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:       My son closed his ear to what I said . I don ’ t know what I should do . 
 Person2:You can twist his arm in order to have a control of him . 
 Person1:        I cannot have the heart to do that . 

informal