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: We'd like to have a look around your house ?
Person2:Yes , of course , please follow me .
Person1: Thank you .
Person2:This is our courtyard .
Person1: It's so spacious , about 40 square metres , right ?
Person2:Yes , about 46 square metres .
Person1: Are these corn ears hanging on the tree branch ?
Person2:Yes .
Person1: Very beautiful and very interesting . But why do you hang them in the tree ?
Person2:They don't have enough time to peel it after they harvested them , so they hung them in the tree . Then in winter , they can peel corn ears in their leisure time .
Person1: Very good idea . Sometimes such pictures can show the house's richness .
informal