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:       Well , I can ’ t believe your uncle and aunt came to stay with us for a week , and they did not even call us in advance . 
 Person2:John , they are old-fashioned people from the Chinese countryside . That ’ s their custom . 
 Person1:        I know , but it is hard for me to get used to your relatives coming to visit us , and without warning . 
 Person2:Don ’ t your relatives visit other relatives ? 
 Person1:        Yes , but Americans never visit without calling in advance , and they almost never stay overnight . 
 Person2:I think that maybe Chinese families are closer than your families . 
 Person1:        I think you ’ re right ! 

formal