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:       I haven ’ t met Bob for years . How is he ? 
 Person2:He has been keeping bach after divorce . 
 Person1:        He would have recovered from the stress and got married again . 
 Person2:Once bitten , twice shy . He said he would rather keep bach than to live in disgust . 

formal