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:       Did Bean send these dirty jokes to you , too ? Look !  
 Person2:What a creep ! Phony good luck e-mails are one thing , but sexual harassment is crossing the line .  
 Person1:        No wonder he asked for my address first-he just wants to harass me !  
 Person2:You could try using a spam filter to reject stuff that's obviously pornographic or anything else you don't want . 

informal