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:       Would you like to play golf with me ?  
 Person2:I would like to . but I'm not good at it .  
 Person1:        It doesn't matter . I will teach you .  
 Person2:That's great ! When will we go ?  
 Person1:        Borrow morning .  
 Person2:All right . What should I take ?  
 Person1:        Just take your golf club . I will pick you up Borrow .  
 Person2:Thanks . I will wait you at my home .  
 Person1:        See you Borrow . 

informal