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:       Did you hear what happened to Mike in Accounts ?  
 Person2:No . What ?  
 Person1:        He got arrested on Friday night and spent the night in jail .  
 Person2:No . Really , what happened ?  
 Person1:        Well , it was all a big mistake , actually . He got home on Friday night really late , and apparently he'd been out drinking with some clients , so he was really drunk .  
 Person2:Was he out with the guys from the bank ?  
 Person1:        Yes , I think so .  
 Person2:Oh , yeah , they always get really drunk .  
 Person1:        Well , anyway , he'd somehow lost his wallet and his house keys , so he couldn't get in . He lives alone , you know .  
 Person2:Oh , really . I thought he lived with his wife .  
 Person1:        No , she left him last year .  
 Person2:Oh , really ? Do you know why ?  
 Person1:        Hang on , let me finish telling you what happened . Where was I ?  
 Person2:He lost his wallet and keys .  
 Person1:        Oh yes , well , he tried to climb in through the bathroom window , but apparently he slipped and broke the glass with his foot . The neighbors heard him and thought a robbery was in progress , so they called the police .  
 Person2:Oh , no .  
 Person1:        Yes . So when the cops arrived , they didn't believe his story  
 Person2:So then what happened ?  
 Person1:        Well , when he sobered up , he called someone from work to come and bail him out .  
 Person2:Well , that's a bit of a tricky situation .  
 Person1:        Yes , I know . 

informal