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:       Do you have a park in the city ?  
 Person2:Yes , there is a lake in the park . It is very beautiful .  
 Person1:        That ’ s great . We can go boating on the lake in the afternoon .  
 Person2:It ’ s a good idea . But I am afraid it ’ s too cold . It is very windy on the lake .  
 Person1:        Then we can take a walk and enjoy the scenery in the park . 

informal