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:       May , look , what's that in the cage ? 
 Person2:Don't you know that ? It's panda . 
 Person1:        Of course I know . I just can't see it very well . 
 Person2:OK , then put on your glasses , and do you know what does the panda eat ? 
 Person1:        Of course , Bamboo ! 
 Person2:That's right . 
 Person1:        I also know they are given to other countries as gifts for friendship . 
 Person2:You sound quite knowledgeable . 
 Person1:        Not really , panda is my favorite animal . 
 Person2:Actually , it likes milk too . 
 Person1:        Any way , in a word , panda is our friend . 
 Person2:Do you know other famous animals in the world ? 
 Person1:        Yeah , let me think , the kangaroo and koala bear from Australia are very famous . 
 Person2:That's right . OK , let's move on . 

informal