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:       I've been standing here since half past seven . Where on earth have you been ?  
 Person2:I'm terribly sorry I'm late . I just couldn't help it .  
 Person1:        It's really very easy saying you're sorry .  
 Person2:Look , just give me a chance . I can explain it . 

informal