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:       Nowadays , ships and boats are no longer so important in transportation as they used to be .  
 Person2:True . With the extension of railways and highways , and the improvement of safety and capacity of airplanes , ships and boats have been giving place to trains , planes and automobiles .  
 Person1:        I read in the newspapers that the passenger liners from Shanghai to Ningpo and Dalian have been out of business ; and the liners up and down the Yangtze River have been reduced by 70 % .  
 Person2:The pace of life of people is now getting faster and faster , so the speed of ships and boats seems to be so slow . I think it may be the reason why people don't like to travel by boat .  
 Person1:        But the most of the transoceanic cargo transportation is still carried by boat . 

informal