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:       Where are you going this weekend ?  
 Person2:I ’ m going to Hainan .  
 Person1:        Oh really ? It ’ ll be nice and warm there . Have you been there before ?  
 Person2:Yes , actually it ’ s my second visit . I was there last October .  
 Person1:        I see . What ’ s it like there ?  
 Person2:Well , the life style is much more relaxed than here in the city . And the seafood is tastier !  
 Person1:        Well , have a great time ! 

informal