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:       Come here ! I can see the tall camphor trees from here .  
 Person2:Yes , we can also see some yew trees .  
 Person1:        This is a great botanical garden in the city .  
 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 . Miss Liu ?  
 Person1:        Do you mean the red flowers ? They are peony flowers ?  
 Person2:The red and yellow peony flowers are so beautiful .  
 Person1:        Yes , you like them very much . right ?  
 Person2:Sure . I'm going to take more pictures today .  
 Person1:        I can help you with it  
 Person2:You are so kind . Thanks . 

informal