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:       Lisa , I ’ Ve been thinking of something . 
 Person2:What is it ? 
 Person1:        Well . I ’ Ve done a lot of business for my company . And now I feel like going into business for myself . 
 Person2:Do you mean you want to sell up your company of your own ? 
 Person1:        There ’ s a possibility . What do you say ? 
 Person2:That ’ s not a bad idea . Bet after all you should get some sound financial guarantee . 

formal