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:       How do you like these dishes ?  
 Person2:Fine , they are colorful and tasty .  
 Person1:        Did you enjoy your dinner ?  
 Person2:Yes , I did . I have never tasted anything like this .  
 Person1:        Would you like some more rice ?  
 Person2:No , thanks . I'm full .  
 Person1:        Another piece of meat pie ?  
 Person2:No , thanks . I'm on diet .  
 Person1:        How about the dessert ?  
 Person2:Ice cream , please . 

informal