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:       This is the first time for me to have a Chinese guest . I hope you like western cooking .  
 Person2:Yes . I like it very much .  
 Person1:        Cooking is a hobby with me . I'm always trying to think up new recipes . I hope you like the soup . It's kind of a specialty of mine , so I hope you enjoy it .  
 Person2:It's excellent .  
 Person1:        Thank you for your compliment.Won ' t you try this fish with white sauce ? I'm rather round of it .  
 Person2:It's delicious .  
 Person1:        What sort of western food do you like best ?  
 Person2:I like beefsteak very much . Have you tried Chinese dishes ?  
 Person1:        I find the Chinese dishes wonderful .  
 Person2:Well , it's getting late . I have to get up early tomorrow . So I must say good night .  
 Person1:        It's still early . 

informal