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 want to go to china for sight-seeing.What do you think of it , Mum ? 
 Person2:Why not ? China is a wonderful country . 
 Person1:        Will you go with me , too ? 
 Person2:No , I'm afraid not now . I'm too busy . 

informal