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:       Pretty ! Say beautiful rather . Can you imagine any thing nearer perfect beauty than she altogether-face and figure ? 
 Person2:I do not know what I could imagine , but I confess that I have seldom seen a face or figure more pleasing to me than hers . 
 Person1:        Such an eye ! The true hazel eye-and so brilliant ! Regular features , open countenance , with a complexion , Oh ! What a bloom of full health , and such a pretty height and size ; such a firm and upright figure ! There is health , not merely in her bloom , but in her air , her head , her glance . One hears sometimes of a child being ' the picture of health ' ; now , she always gives me the idea of being the complete picture of grown-up health . She is loveliness itself . 

informal