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:       Don ’ t do that again . You are riding the tiger .  
 Person2:No problem . I can deal with it well .  
 Person1:        You will ask for it .  
 Person2:All is best now , isn ’ t it ? 

formal