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: What do you plan to do for your birthday ?
Person2:I want to have a picnic with my friends , Mum .
Person1: How about a party at home ? That way we can get together and celebrate it .
Person2:OK , Mum . I'll invite my friends home .

Output: informal

Input: Consider Input: Person1: What have you been up to , Johnny ?
Person2:You know-sweeping , scrubbing , washing , drying , waxing , polishing ...
Person1: Wow , your grandma's really having a field day with you , huh ?
Person2:You got that right ... and my mom's still mad about what we did with the dishes .
Person1: You have all the fun , don't you ?
Person2:Listen , I'd better get back to the grindstone .
Person1: Sure thing , Johnny . Watch out for dishpan hands there , kid !

Output: formal

Input: Consider Input: Person1: I don't think the manager will get mad at you for being late .
Person2:I don't know about that .
Output: informal