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:       What kind of sport do you often do ?  
 Person2:I go jogging , how about you ?  
 Person1:        I used to swim a lot , but now I'm taking gym classes .  
 Person2:Oh , that's fantastic ! 

informal