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:       Yesterday was April the first . 
 Person2:Was it quite special ? 
 Person1:        Not for the others , but for me . I was in the library going over my lessons when suddenly one of my roommates came in . He told me that I was wanted on the phone in my dormitory , and that person would call me again several minutes later . 
 Person2:Did you hurry back to the bedroom ? 
 Person1:        Yes . I went back to the dorm only to find my roommates laughing and shouting " April Fool , April Fool " . 
 Person2:Oh , your classmates took you in . 
 Person1:        Only then did I realize it was April Fools ' Day . 

formal