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 mosquitos are biting me !  
 Person2:Me , too , I can ’ t stop scratching . They are everywhere ! Sneaky little jerks .  
 Person1:        Do you have any bug spray ?  
 Person2:No , I forgot to buy some .  
 Person1:        Then we ’ ll have to put up with it .  
 Person2:We can cover ourselves with beer ! That way if they bite us , they ’ ll get drunk and fall asleep .  
 Person1:        That ’ s without a doubt , the best idea you ’ Ve had ! Let ’ s do it !  
 Person2:Run ! They are thirsty for more ! 

formal