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:       You know , you really ought to get a new pair of jeans . Those are falling to pieces . 
 Person2:But this is how I like them , Mum . They ’ re just beginning to look right . 
 Person1:        Well , you ’ d better get another pair for work at least or you ’ re sacking on the spot . 

informal