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:       It's time to go to bed .  
 Person2:But mum , we're watching this movie .  
 Person1:        I don't care , it's school in the morning .  
 Person2:Just 10 more minutes . 

informal