You will be given a definition of a task first, then some input of the task.
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: Who is the next one ?
Person2:It's Peter's turn .
Person1: Give the mike to him .
Person2:OK .
Person1: Be quiet . He is singing .
Person2:I thought he only liked to listen !
Person1: So did I .
Person2:He has a really good voice !
Person1: Yes , he sings wonderfully .
Output:
informal