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:       At last ! The weekend comes again !  
 Person2:Yes . What will you do these two days ?  
 Person1:        After five days ' hard work , I'm surely going to have some fun .  
 Person2:But I'd prefer to stay at home and have a good rest . 

formal