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: Can you study with the radio on ?
Person2:No , I listen to background music .
Person1: What is the difference ?
Person2:The radio has too many comerials .
Person1: That's true , but then you have to buy a record player .
formal