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:       Why are you so rude to your wife ? 
 Person2:I didn't like her butting in where I didn't want her . She's a chatter box . 
 Person1:        But she means to help you , not to trouble you . 
 Person2:I know . But I just can't stand her butting in when I was trying to emphasize a point . 

informal