Detailed Instructions: 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'.
Q:  Person1:       What ? You want to leave early ?  
 Person2:Yes . Can I ?  
 Person1:        Do you really need to ?  
 Person2:Yes . Is it OK with you ?  
 Person1:        Is it important ?  
 Person2:Yes . Do you mind ?  
 Person1:        You really have to ?  
 Person2:Yes . Will you let me ?  
 Person1:        I guess so . 
A:
formal