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'.

Example Input: Person1: I think Andy's party will be fun .
Person2:Yeah , I think so . Oh , by the way , I need to ask you something .
Person1: What's that ?
Person2:Could I get back the sweater you borrowed ?
Person1: Sure . Oh , that reminds me . Could I borrow your black leather boots ?
Person2:My boots ? Er ... Sure , ok .
Example Output: formal

Example Input: Person1: Mum , can I finish my homework later ?
Person2:Sorry . You know the rules .
Person1: But I want to watch TV now .
Person2:That ' s out of the question .
Person1: Please .
Person2:Not a chance .
Person1: Not even for an hour ?
Person2:Sorry , it ' s impossible .
Example Output: informal

Example Input: Person1: Why are you so late ?
Person2:I've been through a lot today . I forgot to set my alarm clock last night , so I woke up late this morning . And what is worse , I missed the school bus .
Person1: That's enough . Sit down .
Example Output:
informal