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 so hungry . Shall we go eat now , Rick ?  
 Person2:Sure . Where do you want to go ? Are you in the mood for anything in particular ?  
 Person1:        How about some dumplings ? I just can't get enough of them .  
 Person2:Dumplings again ? ! Oh , Amy , let's try something new !  
 Person1:        Well , what do you have in mind ?  
 Person2:How about the Mongolian hot pot ?  
 Person1:        Oh , it's too spicy for me . Don't you remember last time when I tasted the lamb ? It Was so spicy my eyes teared up !  
 Person2:Maybe we can try ' Yuanyang pot ' this time . You can choose the non-spicy soup base .  
 Person1:        Sounds great . Do they serve noodles ? I am in the mood for some tasty noodles as well .  
 Person2:Yes . The sliced noodles they offer are among the most authentic Shanti cuisines .  
 Person1:        Great . Let's go !  
 Person2:Wait a minute . Let me throw on a sweater . 

informal