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:       Didn't you say you were planning a trip to China ? I heard the northwest and north of China are experiencing severe sandstorms !  
 Person2:I was planning to go to Beijing first and then go to northwest China ! Looks like I'm in trouble .  
 Person1:        Definitely . I heard Beijing was experiencing seven degree strong winds ! That is nearly a record high !  
 Person2:No way ! I don't think I've ever encountered winds that strong ! Are the storms affecting land and air transportation ?  
 Person1:        Absolutely ! I don't think any planes are going anywhere . The sand being blown around has cut visibility in Beijing to less than 100 meters . But inseems Gansu Province is being hit the hardest .  
 Person2:That's exactly where I was planning to go !  
 Person1:        Well , this storm originated in the plateaus in northwest China . At the moment , that area is calmer . 

formal