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:       Hey , Mark , long time no see .  
 Person2:Julie ! It's good to see you again . How have you been ?  
 Person1:        Great . I just got back from a week's vacation in Thailand .  
 Person2:Really ? How was it ?  
 Person1:        Fantastic ! I didn't want to come back .  
 Person2:I hear the beaches in Thailand are beautiful .  
 Person1:        They are . And not only that the people are friendly , but also the food is delicious , not to mention cheap .  
 Person2:I do like Thai food . Did you see much of Bangkok ?  
 Person1:        Not much . I've got enough city life in Beijing .  
 Person2:I know what you mean . I could use a vacation myself .  
 Person1:        Hey , wouldn't it be great if we could go to Thailand together sometime ?  
 Person2:Yeah , it sure would . 

informal