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 think I need a new notebook .  
 Person2:Why ? Is there some new , cool computer out on the market ?  
 Person1:        You bet there is . Feast your eyes on this puppy !  
 Person2:That's a notebook ?  
 Person1:        Believe it !  
 Person2:It looks more like a toy , or a cool briefcase ! 

formal