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:       Why are there still so many people overweight despite the current fitness craze ?  
 Person2:Well , there are certain factors that effect people's size and weight .  
 Person1:        What are they ?  
 Person2:One study said that low-income groups have a higher percentage of over-weight people than higher income families .  
 Person1:        Why ?  
 Person2:The survey said that the low , income groups eat more junk food on a daily basis .  
 Person1:        That makes sense . Probably less time to make dinner and the junk food is cheaper .  
 Person2:And junk food contains lots of fat and oil . There is one final reason why so many people are fat .  
 Person1:        What's that ?  
 Person2:Nobody exercises any more-not even kids ! The average American home has the TV on for 6 hours a day !  
 Person1:        Wow ! No wonder people are so fat . Say , Carl , looks like you could be doing a bit more exercising .  
 Person2:Yeah , I guess so .  
 Person1:        You should consider eating healthier food and getting some more exercise .  
 Person2:Hey , I started a diet and lost 10 pounds .  
 Person1:        So what happened ?  
 Person2:Well , I quit and gained it back plus 5 pounds .  
 Person1:        You should have kept trying . 

informal