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:       Where did you go yesterday ?  
 Person2:I went to play tennis in the public park .  
 Person1:        How often do you play tennis ?  
 Person2:Twice a week . How about you ?  
 Person1:        I seldom play tennis . I prefer football and basketball .  
 Person2:What is very difficult to gather team player together .  
 Person1:        I usually play with my school-mates .  
 Person2:Do you like watching football matches ?  
 Person1:        Yes . I went to Tinge Sport Centre for football match last Sunday . 

formal