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:       This is my friend Jenny .  
 Person2:What's her last name ?  
 Person1:        It's Snow .  
 Person2:What color are her eyes ?  
 Person1:        They're blue .  
 Person2:What color is her hair ?  
 Person1:        It's brown .  
 Person2:How old is she ?  
 Person1:        She's 42 . 

formal