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:       May I take your order ?  
 Person2:I'd like to see the menu , please .  
 Person1:        Oh , I'm so sorry . I thought you had one . Here you are .  
 Person2:Don't you have any Chinese food ?  
 Person1:        I'm afraid we don't . But I'm sure you'll enjoy our lunch special . 

formal