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:       That radio's pretty loud . Could you turn it down , please ?  
 Person2:Sorry . Was I disturbing you ?  
 Person1:        Yes . And something else , please don't borrow my clothes without asking .  
 Person2:Sorry . I guess I wasn't thinking . I won't do it again . 

formal