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:       It ’ s a wonderful party , Joan , The food , the drink , the atmosphere ... Everyone is enjoying himself .  
 Person2:Thanks to your help.To our friendship .  
 Person1:        Bottoms up ! By the way what kind of entertainment are we gonna have ?  
 Person2:Dancing . The boys from the Campus Band have promised to play music for us .  
 Person1:        Oh , how wonderful ! Every girl on the campus has a crush on those handsome guys .  
 Person2:I'll surely make introductions for them . 

informal