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:       On Saturday night I ’ m going to have a small get-together .  
 Person2:Good .  
 Person1:        Would you like to come ?  
 Person2:Do you mean this Saturday ?  
 Person1:        Yes , this coming Saturday .  
 Person2:Thanks for inviting me , Jack , but I ’ Ve already made plans for this weekend . I won ’ t be able to come , I ’ m afraid .  
 Person1:        I ’ m sorry to hear that .  
 Person2:Yeah , that ’ s too bad .  
 Person1:        Well , perhaps , another time . 

formal