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:       Table-tennis is our national game .  
 Person2:Yes , I like ping-pong very much , but I can't play well .  
 Person1:        I can't , either . I like watching . 

informal