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:       Lucy , come here ! I can see the lake which is in the center of park .  
 Person2:It is beautiful ! Look , there are so many birds around it .  
 Person1:        It is a great place for a relaxing vacation .  
 Person2:Listen to the sound of nature ! It's like music .  
 Person1:        Yeah , I agree . It makes you feel really good .  
 Person2:What are those ?  
 Person1:        Do you mean the red things ? They are roses .  
 Person2:I'm going to take more pictures today .  
 Person1:        Me , too . 

informal