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:       Dad , I've finished my homework . 
 Person2:Well , what game do you want to play ? 
 Person1:        Do you want to play poker ? 
 Person2:Do you know how to play it ? 
 Person1:        I'll teach you . 
 Person2:OK . Teach me how to play the game . 

formal