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 set your clock forward for daylight savings time ?  
 Person2:What ? Why do we have to do that ?  
 Person1:        Well , at the start of the spring we usually have more daylight in the mornings and less in the afternoon . This is basically due to our position on the planet and the rotation of the earth . In any case , to take better advantage of the daylight available , we compensate by moving our clocks forward one hour .  
 Person2:I see . That ’ s convenient ! I never understood things like this , such as GMT . I never know what time zone we are in or when to change my clock !  
 Person1:        That just stands for Greenwich Mean Time . Here in California , we are in Pacific Standard Time , that is eight time zones west of Greenwich . Remember when we were in Beijing ? Well , then we were in China Standard Time , and that ’ s eight time zones east of Greenwich !  
 Person2:That ’ s why it was so weird traveling from Beijing to LA ! Because of the huge time difference , even though we left Beijing at noon and flew for more than eight hours , we still arrived in LA the same day at noon ! It ’ s like we went back in time ! 

informal