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:       Did you go to the bank to withdraw money ?  
 Person2:Today is so hot , besides I had so much housework to do . My friend came for a visit and stayed for two hours . I didn ’ t forget , but I had no time at all .  
 Person1:        So you didn ’ t . Is that right ?  
 Person2:Yes . I ’ m sorry .  
 Person1:        Why didn ’ t you just answer my question directly ? Why would Chinese answer questions this way ? I simply asked if you did it or not . It ’ s a very simple question . And Chinese often give the reason before they would give a direct answer .  
 Person2:Yes , I ’ m sorry . I know it bothers you very much . But I don ’ t know why Chinese sometimes would do this .  
 Person1:        You know , today I asked a student if he brought his dictionary with him . It ’ s a rule I made for the class that everyone brings a bilingual dictionary with them because sometimes they don ’ t understand me . The funniest thing is that this student gave me a lot of reasons and no direct answer .  
 Person2:But you know if he brought it or not , right ?  
 Person1:        Yeah , after all the explanations like , it ’ s too heavy , I was in a hurry ... whatever . 

informal