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:       Tomorrow I'll take you to some places that I'm sure you will have interest in .  
 Person2:Where else haven't we been to yet ?  
 Person1:        They are the Folk Antique Handicrafts and Collectibles Exhibition Halls .  
 Person2:Sounds great ! How many kinds of folk collections do they have ?  
 Person1:        Well . there're actually over 200 kinds of folk collections in this city . That's half the collections of antique objects in China . There's one exhibition half for multiple collection , and several individual display rooms for private collectors .  
 Person2:Private collectors ! They must have excellent collections . I'II go and see each of them . What kinds of collections can I see ? Come on , don't keep me in suspense !  
 Person1:        No hurry ! I'II tell you now , The collections include ancient cases and caskets , tea sets , abacuses , precious sea shells and conches , drama costumes , agates , ancient coins , fans , mini-musical instruments , root-carving , rare stones and rocks , model ships , model cars ...  
 Person2:Enough ! I can't wait anymore . 

informal