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:       Maybe we'd better go now .  
 Person2:It's still early .  
 Person1:        Gosh , it's already 10.Stay here if you like .  
 Person2:Since we're late , let's go to see a film .  
 Person1:        OK.Hurry up . 

informal