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: Consider Input: Person1: I always think everybody looks down on me
Person2:Don't be that negative .
Person1: How can you be optimistic ? You can see it in their eyes .
Person2:I find it there is no meaning in living this world .
Person1: Don't be that negative .
Person2:Really , life is so boring .

Output: formal

Input: Consider 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 .

Output: informal

Input: Consider Input: Person1: What a coincidence seeing you here . !
Person2:It is , isn't it ?
Output: informal