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:       I need a suggestion for a restaurant here in Manhattan .  
 Person2:Certainly ! How much are you planning to spend on dinner , sir ?  
 Person1:        My date's very sophisticated , so I'm sure she would expect nothing but the best .  
 Person2:May I suggest our own hotel restaurant ? It got three stars in the latest restaurant review .  
 Person1:        No , thank you , I want to go out on the town . What other ideas do you have ?  
 Person2:There's always Gramercy Tavern . They have live jazz . The food is delicious , but very expensive .  
 Person1:        That sounds like a good place to take a date . Can you make a reservation for me ?  
 Person2:As you wish , sir . You'll have a wonderful time there . 

formal