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:       Everybody , I'd like to propose a toast to Mary Johnson , Teacher of the Year . She worked hard all year . She really deserved the honor .  
 Person2:Yes , we're all proud of her !  
 Person1:        Here's to you , Mary !  
 Person2:Cheers ! 

informal