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:       Do you know how to play go ? 
 Person2:It's easy . All you have to do is to use your pieces to surround the opponent's pieces and then take over all of his territory . 
 Person1:        But I heard it is very difficult to play . 
 Person2:It's easier said than done . When you actually play , it can be very frustrating . 

formal