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:       Say , do you go to see your grandparents often ?  
 Person2:Of course , my grandpa is generous and kind.My grandma cooks the most delicious Chinese dishes in the world .  
 Person1:        You are very lucky . 

formal