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 visited the Polar Aquarium today .  
 Person2:Is it like a zoo of polar animals ?  
 Person1:        Almost . There are a lot of polar animals sea birds , such as seals , whales and penguins , People don't get much chance of seeing them .  
 Person2:It must have been fun seeing those unusual animals and birds .  
 Person1:        Absolutely . To be frank , I learned quite a lot about those animals and polar areas . I'm thinking of my kids there one of these days .  
 Person2:Maybe you should let me know about your plan . I want to take my kids there some day . too . 

formal