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:       Billy , you are late again .  
 Person2:I'm sorry I'm late . I overslept . Is the manager here today ?  
 Person1:        Yes he ' s in his office .  
 Person2:Oh , I hope he didn't notice me .  
 Person1:        Don't take any chances . It'd be best if you told him and promised not to be late again . He's already mad at you for last 2 times . Any more and he might fire you .  
 Person2:You said it . It won't happen again . Do you really think he'd fire me ?  
 Person1:        I think he might . You'd better go to his office .  
 Person2:You are probably right . I'll go right now and apologize . I try hard not to be late but it is difficult with Beijing traffic .  
 Person1:        Good luck ! 

formal