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 , where have you been ?
Person2:I was away for my vacation .
Person1: Oh , how was it ?
Person2:Good . I wish I could have another vacation .
informal