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 .. eh 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 , do you want to go and do something ? 
 Person1:        Yes , yes , I want to take you to dinner . 
 Person2:Oh , that sounds great . How about 6 o ’ clock ? 

informal