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:       Doesn't she have any friends ? 
 Person2:If she has , they must be fair-weather friends . 
 Person1:        Such friends are even worse than enemies . 
 Person2:She'd better keep away from them . 

formal