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:       I need to know why I'm being charged $ 10 for a movie that I never ordered . 
 Person2:Hmm . Your file shows that you watched ' Titanic ' Monday night . 
 Person1:        Monday night ? Monday night I was at a great concert . 
 Person2:Well , as they say , garbage in , garbage out . Let me correct this error , please . 
 Person1:        Thank you . It's very nice when problems can be solved quickly . 
 Person2:When I deleted the $ 10 , the computer automatically added a $ 2 service charge . 
 Person1:        Are you crazy ? You made the mistake and now you're charging me for your mistake ? 
 Person2:Sir , if it makes you feel any better , the $ 2 service fee used to be $ 5 . 
 Person1:        Why don't you just stick a gun in my ribs and take everything I have ? 
 Person2:Unfortunately , sir , you'll have to pay the $ 2 , whether you like it or not . 

informal