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 really need to lose some weight . I should go on a diet .  
 Person2:I think you should work out more too .  
 Person1:        Wow ! You are much skinnier since the last time I saw you .  
 Person2:I have lost about five kilos .  
 Person1:        How did you do it ?  
 Person2:I was on a diet and exercised daily .  
 Person1:        I hate working out .  
 Person2:You can try a low-impact workout schedule . Why don't you go to a gym ?  
 Person1:        Good idea . Then the trainer will help me to make a fitness plan . Besides that , what's your secret ?  
 Person2:The secret is persistence . 

formal