Instructions: 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'.
Input: Person1: I ' d better be going .
Person2:So soon . Why don ' t you stay a little longer ?
Person1: I wish I could , but It ' s already late .
Person2:Oh . It ' s pity you have to leave .
Person1: thank you for wonderful meat .
Person2:I'm glad you enjoy it .
Output:
informal