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 Jane , you look great .  
 Person2:You too . Have you lost some weight ?  
 Person1:        Yes , I took off 4 kilos . I am glad you notice it .  
 Person2:Not some crazy diet fat I hope .  
 Person1:        No no , I just changed my eating habits . I eat a balance meal . and I eat less than before .  
 Person2:Good for you , keep it up . 

informal