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:       Would you and your wife care to come to our place and have tea with us some afternoon ?  
 Person2:Why , that's very kind of you , Mrs . Johnson . I'm sure my wife will be glad to .  
 Person1:        How about tomorrow afternoon ?  
 Person2:Tomorrow afternoon would be fine . 

informal