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 have a suggestion . Why don't we go to a ETV and sing ?  
 Person2:A ETV ? Are you serious ? ETV ?  
 Person1:        Yes , why not ? Don ’ t you like ETV ?  
 Person2:I don't know . I never went to one .  
 Person1:        Never ? Really ? I'm surprised .  
 Person2:Many Americans have never gone to a ETV . It ’ s not an American thing to do .  
 Person1:        But there are a lot of Kts in this town . There's one just two blocks from here .  
 Person2:OK , let's go . 

informal