Q: 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: Hi , I'd like to return this radio .
Person2:All right . Do you have the receipt ?
Person1: Here it is .
Person2:May I ask why you're returning the radio ?
Person1: It does not work very well .
Person2:Would you like to exchange it ?
Person1: No . I'd just like a refund .
Person2:Certainly . This will take only a few seconds .
A:
formal