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 National Day is coming . What are you going to do during the holiday ?  
 Person2:I have no idea .  
 Person1:        Why don't you go sightseeing ?  
 Person2:It isn't a good time because there must be many tourists in the scenic spots . What about your plans ?  
 Person1:        I intend to stay at home for the whole seven days and have a good rest . 

formal