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:       Where is some fresh produce that's on sale ?  
 Person2:Well , I think you'll like the mangoes .  
 Person1:        I've never had a mango .  
 Person2:It's a fruit . It has a big stone in it .  
 Person1:        Can you eat the stone ?  
 Person2:No . You would break all your teeth on it .  
 Person1:        How much are these mangoes ?  
 Person2:The sale price today is $ 1 each .  
 Person1:        Can you describe their taste ?  
 Person2:They usually taste sweet , but they remind me of an orange .  
 Person1:        How can I tell if they're ripe ?  
 Person2:Don't cut into them until you can feel that they're soft on the outside .  
 Person1:        What country produces them ?  
 Person2:They come from tropical countries . 

formal