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:       Hi , Mr . Smith . Are you enjoying the cookout ? You don't look too happy .  
 Person2:I spent the morning at the cemetery . I put flowers on the graves of my old war buddies .  
 Person1:        Is that what people usually do on Memorial Day ?  
 Person2:They should . This holiday is about remembering our war dead . But people these days think it's just a holiday for summer sales and cookouts !  
 Person1:        I'm sorry to hear that . Thank you for telling me a little more about it . 

formal