Detailed 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'.
Problem: Person1: I went to Rotes ' , you know , Edith Roth is the author of a book about moths .
Person2:Is she ? I thought she was a mathematician .
Person1: I ' m so thirsty .
Person2:Are you ? I thought you had something to drink at her home .
Person1: No . Edith didn ' t give anything to drink .
Person2:I ' ll buy you a drink .
Person1: Oh ! Thank you .
Solution:
informal