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:       Dad , what's the date ? 
 Person2:It's December eighteenth . 
 Person1:        In seven days it will be Christmas Day . 
 Person2:Yes , I know that . 
 Person1:        So , can I buy some new shoes as a Christmas present ? 
 Person2:Sure , a promise is a promise . 

informal