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 help you , sir ?  
 Person2:I'd like a table for two , please .  
 Person1:        Do you have a reservation , sir ?  
 Person2:No , I'm afraid not . Can I sit over there ? There's a table free by the window .  
 Person1:        Sorry , sir . That table has been reserved . This way , please . How about this one , sir ?  
 Person2:Fine . I'll sit here .  
 Person1:        Would you like some drinks ?  
 Person2:I'll have a double whiskey on the rocks . 

informal