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:       Shall we for go out for a meal this evening ? 
 Person2:I don ’ t really mind . 
 Person1:        We can go to that new Chinese restaurant . 
 Person2:I suppose I could . 
 Person1:        Come on , let ’ s try it . 
 Person2:All right . If you really want to . 

informal