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:       Does anyone need a drink ?  
 Person2:I'll take one . How's the cooler situation ?  
 Person1:        It's still stocked , and there's plenty of ice . Here you are-cheers !  
 Person2:Cheers . You guys didn't drive , did you ?  
 Person1:        No , we walked . Why , do you need us to carry some stuff home later ?  
 Person2:No , it's just that it's a holiday . With everyone out partying , there's a lot of drunk driving . 

formal