Instructions: 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 .
Output:
informal