Definition: 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:       Last night I looked for my Indian classmate Barbara . I found her sitting with her legs crossed and quietly practicing . 
 Person2:Needless to say , it must be Indian Yoga . 
 Person1:        Mary , you say something about it . 
 Person2:Tracing back , Yoga has a very long history . It was originated before India had approved Yoga and these documents were arranged and written according to the contents passed by mouth to mouth . In other words , Yoga is passed down from ancient times , which cannot be recalled . 

informal