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:       I've been chosen to plan the next family reunion .  
 Person2:Fun for you ! Do you get to do anything you want ?  
 Person1:        Yep . And I should start planning now .  
 Person2:Does everyone usually show up for your family reunions ?  
 Person1:        Just about . There are at least a few hundred in our immediate family alone .  
 Person2:How Ay days will the reunion be ?  
 Person1:        Usually it's at least five days and four nights .  
 Person2:This is going to be a major production for you ! 

informal