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:       Do you like tea ?  
 Person2:Yes , but I don't know much about it .  
 Person1:        Tea does good to people's health . There are many kinds of tea.Say , black tea , green tea , scented tea , brick tea , milk tea , Jas - mine tea , chrysanthemum tea and so on .  
 Person2:My favourite is Jasmine tea . I like its aroma .  
 Person1:        Yeah , but scented tea is now in fashion . 

formal