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:       Can I take your order , sir ?  
 Person2:I ’ ll have the kung PAO chicken , please .  
 Person1:        Certainly sir , would you like some rice or noodles with that ?  
 Person2:Just some fried rice please .  
 Person1:        Ok , would you like some soup as well ?  
 Person2:No , thanks .  
 Person1:        Thank you very much . Your food will be ready soon . 

informal