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:       You should draw a picture of a fancy kingdom of animals in forty minutes .  
 Person2:All right . But how ?  
 Person1:        Just imagine , if a horse can fly , if a bird can swim ... and things like that .  
 Person2:I see . But could you give me another piece of paper ?  
 Person1:        OK . Here you are . Anybody who wants help , please come to me .  
 Person2:Thank you so much , Mr Addison . 

informal