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:       It is time to butter him up . 
 Person2:What do you have to do to grease the palm of him ? 
 Person1:        I don ’ t know . Let me see . 
 Person2:You can go and ask your father . 

informal