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:       What are you doing this weekend ?  
 Person2:Nothing much . I ’ m going to the cinema on Friday night but that ’ s all I have planned .  
 Person1:        So you ’ re free on Saturday night ?  
 Person2:That ’ s right .  
 Person1:        Would you like to have dinner with me ?  
 Person2:Oh , that would be lovely . Shall we say seven o ’ clock ?  
 Person1:        Perfect . I ’ ll pick you up then . 

informal