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 was the last movie you saw ?  
 Person2:A Korean film called Friends , starring Sang Dong-gun .  
 Person1:        Really ? I've seen that movie , too .  
 Person2:How did you like the movie ?  
 Person1:        I thought it was pretty good .  
 Person2:Really ? I can't say I agree .  
 Person1:        You're kidding . The story and acting were outstanding .  
 Person2:I guess I expected too much from the movie , so I was a bit disappointed .  
 Person1:        I guess it could happen . 

informal