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:       Tom , we are in the restaurant now !  
 Person2:May I take your order ?  
 Person1:        I'd like to see the menu , please .  
 Person2:OK , here you are .  
 Person1:        Thanks . I am starving . Tom , what are you getting ?  
 Person2:I have no idea . First time here .  
 Person1:        Let me see ... What's this , shrimp rolls ?  
 Person2:Oh , it's rice rolls with fried shrimp inside .  
 Person1:        Twenty five yuan is a little expensive .  
 Person2:There are twenty rolls in a bowl . You can get another bowl for free if there aren't enough rolls .  
 Person1:        Sounds nice . We will take this , two bowls of shrimp rolls .  
 Person2:OK , shrimp rolls . Do you want anything else ?  
 Person1:        We will have this one first and order something else later .  
 Person2:OK , wait a moment please . 

informal