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:       Who is your favorite NBA star ? 
 Person2:Kobe Bryant , of course . 
 Person1:        Kobe ? I know him , the key guy of the Lakers , a heck of a NBA player . He is on fire when he breaks through enemy defense . 
 Person2:He is competent both in driving the lane and shooting jumpers , but what really makes him formidable is his ability to switch up and dribble with his left hand . 
 Person1:        Maybe he is not good at rebounding ? 
 Person2:Indeed , no man can be perfect . He is just so-so in crashing the boards . Usually he plays shooting guard . Rebounding might not be his strong suit . 
 Person1:        Kobe came to Beijing during this summer's Olympics . Did you go to the match between China and USA ? 
 Person2:Who wouldn't ! My friend Lee went so far as to get an autograph from him . 
 Person1:        Well then , what are your spoils ? 
 Person2:Well , nothing more than a jumble of photographs . 

formal