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 is your hobby ?  
 Person2:I spend most of my spare time reading . And I subscribe to various newspapers , magazines and periodicals .  
 Person1:        What kind of reading materials do you like best ?  
 Person2:I am interested in science fiction . 

informal