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:       What do you think of the novel you just finished reading ?  
 Person2:I like it a lot . It has a very funny beginning , I think . It attracts your attention the moment you begin reading it .  
 Person1:        What do you like best about it ?  
 Person2:I like the plot . It's so full of twists and turns . I also like the main character . She is so humorous and smart .  
 Person1:        What do you think of the ending ?  
 Person2:The ending is a bit weak . It's so abrupt , like those of most other detective stories . 

formal