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:       You look like a basket case .  
 Person2:I'm not surprised .  
 Person1:        What's the problem ?  
 Person2:My brother in-law just dropped in from the states .  
 Person1:        Yeah , and ?  
 Person2:I decided to put him up while he's here , big mistake !  
 Person1:        Why ?  
 Person2:He's lazy . I tried being a good host , but if you give him an inch , he'll take a mile .  
 Person1:        I guess you think twice next time he comes .  
 Person2:You can say that again .  
 Person1:        So how long has he here for ?  
 Person2:Two weeks . If he thinks I'll put up with his attitude that long he's got another thing coming .  
 Person1:        Well , I know you do the right thing . 

informal