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:       Will you go with us this Sunday ?  
 Person2:What for ?  
 Person1:        Let's go and play volleyball .  
 Person2:Sorry , I don't feel like playing . I have too much homework . 

informal