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:       Good morning . I ’ m thinking about buying some new furniture for my living room . Could you help me ?  
 Person2:Certainly . As you can see , we have several three-piece suites on sale . Feel free to sit down and test how comfortable they are .  
 Person1:        I came to your store yesterday and have come back today to make a final decision . I think I like the black leather suite . It's on sale , isn't it .  
 Person2:Yes . The price has been reduced by 50 % . It ’ s a real bargain .  
 Person1:        I ’ ll take it . I also need to improve the lighting in my living room . Do you have any suggestions ?  
 Person2:Those floor lamps are very nice and you can vary the brightness according to whether you ’ re reading or watching tv . How big is your living room ?  
 Person1:        It ’ s quite large . It ’ s about 40 square meters .  
 Person2:I ’ d suggest you buy two . That allows you to change the brightness of the room better .  
 Person1:        OK . I like the design of this lamps . I also need some cushion covers . I ’ ll just browse through those ones over there . 

formal