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:       The May Day holiday is coming . Have you made any plan ? Are you going to stay here or go out for a traveling ?  
 Person2:I haven ’ t decided yet . But I may go out .  
 Person1:        Where have you planned to go ?  
 Person2:I want to go to Shanghai , but I also want to visit Hainan .  
 Person1:        Then which will be your first choice ?  
 Person2:I don ’ t know . How about you ? are you staying here or somewhere .  
 Person1:        I have decided to go to Tasha .  
 Person2:By train or by plane ?  
 Person1:        By plane . 

formal