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:       Hi , dear , do you know what the important day is today ?  
 Person2:I don ’ t know .  
 Person1:        Please think it over .  
 Person2:Oh , I see .  
 Person1:        Come on , dear . I know you mustn ’ t forget it .  
 Person2:It ’ s Saturday , a great weekend .  
 Person1:        Ur , you really let me down .  
 Person2:Don ’ t be angry with me . I have a bad memory .  
 Person1:        No , you haven ’ t . You just don ’ t care about me . You ’ re an indifferent husband .  
 Person2:What day is it on earth ?  
 Person1:        It ’ s the anniversary of our weeding . 

informal