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:       It's a perfect day for swimming .  
 Person2:I am going to the beech . How about coming with me ?  
 Person1:        Great ! I love swimming . Besides , I need a tan for Hill ’ s party ..  
 Person2:Don't forget the sun block lotion . You don't want a sunburn , do you ?  
 Person1:        No . Thanks for reminding me . 

informal