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:       Hey , where's Cindy ?  
 Person2:She told me that she's got tennis practice today .  
 Person1:        You're Mary , right ?  
 Person2:How did you know ?  
 Person1:        Cindy told me about you in our gym class .  
 Person2:I see . Do you live in this neighborhood , too ?  
 Person1:        My house is next door to yours .  
 Person2:Oh , Cindy did mention you before . You're Alexander Newman .  
 Person1:        Just call me Alex . Alex and Alexander are the same thing . 

formal