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:       Where are you going ? 
 Person2:I'm going to Bill's house . 
 Person1:        What are you going to do there ? 
 Person2:I'm going to help him . 
 Person1:        What's he doing ? 
 Person2:He's fixing his roof . 

formal