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:       Hi Sarah , how are you ?  
 Person2:Fine , how are you doing ?  
 Person1:        OK .  
 Person2:What do you want to do ?  
 Person1:        I'm hungry . I'd like to eat something .  
 Person2:Where do you want to go ?  
 Person1:        I'd like to go to an Italian restaurant .  
 Person2:What kind of Italian food do you like ?  
 Person1:        I like spaghetti . Do you like spaghetti ?  
 Person2:No , I don't , but I like pizza . 

informal