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'.

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