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:       What's the matter with you ? You look so upset and tired .  
 Person2:My father failed in business .  
 Person1:        Oh , that's really tough .  
 Person2:Maybe it is the most difficult period of my family have experienced .  
 Person1:        I can understand . By the way , is there anyway I can help ?  
 Person2:No , not now . I have found a part-time job . So perhaps I can help my family to come over the difficulties .  
 Person1:        Oh , that's so great , bless you ! if you need me , I'll always be there .  
 Person2:Thank you . 

informal