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:       I ’ m hungry , let ’ s grab a bite to eat .  
 Person2:Sure ! How about we go home and prepare a couple of sandwiches ?  
 Person1:        Nah ! Let ’ s go get a burger and fries .  
 Person2:All you ever do is have unhealthy fast food Pizza , fries , burgers and hot dogs ! You have to start eating better !  
 Person1:        What are you talking about ? I have salads some times .  
 Person2:Yeah right ! I ’ m serious ! You should also cut down on your sugar intake as well . You drink carbonated drinks that are high in fructose syrup ! It ’ s really not healthy !  
 Person1:        Fine ! I ’ ll start drinking and having home cooked meals that are low in fat . Are you happy now ?  
 Person2:It ’ s a start , but I ’ ll be happy when I see you stick to your promise ! 

informal