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:       Hi Bob , how ’ s business ? 
 Person2:Just okay . 
 Person1:        Okay , enough small talk . Let ’ s get down to business . 
 Person2:Good idea . 
 Person1:        Since we ’ re good friends , you don't have to pay me . 
 Person2:No , I can ’ t accept it . Business is business . 

informal