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 typed the report .  
 Person2:Well done .  
 Person1:        And I've filed the letters .  
 Person2:Excellent job .  
 Person1:        And I've checked the orders .  
 Person2:I'm very impressed .  
 Person1:        And I've ordered the supplies .  
 Person2:Congratulations . You should be very proud of yourself . 

informal