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:       Can you believe her ? She is not even a hundred pounds and she is going off on how she wants to go on a diet .  
 Person2:Tell me about it . If I was as small as her , I wouldn't think about going on a diet .  
 Person1:        Me too . But what are we going to do ? I have been on 4 different diets and I can't seem to lose weight .  
 Person2:That's because you don't exercise . If you were more active , you wouldn't have a dieting problem .  
 Person1:        What do you know ? You are over weight too .  
 Person2:I'm not on a diet though .  
 Person1:        I know . But I don't have someone to diet with . If we help each other and motivate each other , then I think we can lose some weight .  
 Person2:I like ice cream too much though .  
 Person1:        C'mon . You'll feel better and look better and as a reward you can eat a little bit of ice cream here and there .  
 Person2:It does sound appealing .  
 Person1:        It's a great idea . I can't believe I didn't think of this earlier . Going on a diet with a friend to back you up is a great way to succeed .  
 Person2:Okay . I'm in . Let's do it .  
 Person1:        Great . I'll get our plan started right away .  
 Person2:Can we start tomorrow though ? 

informal