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 have the five dollars I lent you yesterday ?  
 Person2:Oh I forgot ! I'll run home real quickly and bring you the money .  
 Person1:        You don't have to go right away .  
 Person2:I'd hate for you to think I was lazy in returning your money . 

informal