Q: 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'.
 Person1:       Study hard , otherwise you'll fail .  
 Person2:Yes , Mum .  
 Person1:        Don't render me lip-service , you'd better stay at home tonight .  
 Person2:But it's Sunday , isn't it ? 
A:
formal