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:       Linda , would you care for some candies or cookies ?  
 Person2:No , don't try to tend me . I'm becoming chubby , and I have to slender down .  
 Person1:        You are not really chubby . You are actually thin enough .  
 Person2:I don't think so . I know I've put on weight this winter .  
 Person1:        So you are watching your weight , aren't you ?  
 Person2:Yes , to tell you the truth . I am on the diet . 

formal