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:       Jenny , I was wondering if you , um ... are you busy this Friday ?  
 Person2:Yes , Friday I have a class right after work .  
 Person1:        Oh . What about Saturday ? Are you free then ?  
 Person2:Saturday my parents are coming to town . What's up ?  
 Person1:        What about tonight ? Do you have plans tonight ?  
 Person2:No . Did you want to go do something ?  
 Person1:        Yes ! Yes ! I want to take you to dinner .  
 Person2:Oh ! That sounds great ! How about six o'clock ? 

informal