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:       Excuse me , waiter , would you please give us a menu ?  
 Person2:Sorry , sir , here you are .  
 Person1:        Well , do you have a menu in Chinese ?  
 Person2:Please wait a moment , I will bring you one . 

formal