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:       Did you read the news that ' China's property prices rose at the fastest pace in 18 months in December , ending the year with rising fears of bubbles in the property market ' ? 
 Person2:No . Does the newspaper say what has caused that ? 
 Person1:        Yes . It says the hike was a result of purchase rush in the fourth quarter on expectations of tightening politics . 
 Person2:I think the government should make a serves of moves to cool the market . 
 Person1:        Right . The climbing property prices has become a headache for Chinese residents . 

formal