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:       What is the matter with him ? 
 Person2:I don't know , what's wrong ? 
 Person1:        I feel he is as cold as charity to me . 
 Person2:Maybe you should ask him openly . 

formal