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:       What's going on ?  
 Person2:Nothing really . How about you ?  
 Person1:        A lot , like the party I'm having on Friday .  
 Person2:Well , that's cool .  
 Person1:        Will you be able to make it ?  
 Person2:I'm busy this Friday . I'm sorry .  
 Person1:        What do you have to do ?  
 Person2:I'm having dinner with my family  
 Person1:        Maybe you can come next time .  
 Person2:I'll make sure and come to your next party .  
 Person1:        I'll look for you at my next party .  
 Person2:I'll be there . 

informal