Given the task definition and input, reply with output. 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'.

Person1: Have you ever sung with a karaoke ?
Person2:Yes , I do it quite often .
Person1: Karaoke has become a major entertainment . I wonder why .
Person2:Simple , it's fun .
Person1: How much fun is there in singing in front of other people , especially if you don't sing well ?
Person2:Ah , that's the biggest fun of all . You see , even though you're not a good singer , people will listen to you .
Person1: I wouldn't do that .
Person2:But I like the feeling .
formal