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:       Who's that man over there talking to James ?  
 Person2:Where ? Oh , that's Henry .  
 Person1:        He's very handsome , isn't he ? What's he like ?  
 Person2:He's very nice , actually , but rather eccentric .  
 Person1:        Really ? I love eccentric people .  
 Person2:Yes , but he may be too eccentric even for you .  
 Person1:        Why ? What do you mean by that ?  
 Person2:Well , haven't you heard ?  
 Person1:        Heard what ? No one ever tells me anything .  
 Person2:Well , apparently , he's been having an affair with his secretary .  
 Person1:        Really ! How fascinating .  
 Person2:According to Mary , he's divorcing his wife and there's a big fight going on about the children . I thought everyone knew .  
 Person1:        Well , what can I say ? I didn't know . Oh , I meant to tell you earlier , your blouse doesn't really match your skirt . Those colors don't really suit you either .  
 Person2:Oh . Thanks . Look , I must just go and say hello to someone . I'll be right back . 

informal