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:       So the apartment comes unfurnished ?  
 Person2:This one is . I have another one that's furnished , but I'm not sure you'll like the furniture .  
 Person1:        We have tons of furniture . What we need are air conditioners .  
 Person2:This building is only four years old . It was built with central air .  
 Person1:        Just like in the States ! That's perfect !  
 Person2:And I recently bought an American-style washer and dryer . Come and see . 

informal