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:       How did you first meet Jack each other ?  
 Person2:That is a heavy raining afternoon . I was standing under the eaves of a shop to evade the heavy rain . It's getting dark .  
 Person1:        And then ?  
 Person2:I was trembling in the wind when he ran to me with an umbrella in his hand and asked , ' Where is your home ? '  
 Person1:        Then he sent you to your home ?  
 Person2:Yeah .  
 Person1:        It's a romantic meeting . I can say that a hero saves a beauty .  
 Person2:He joked later that I was so poor that he had a kind of impulse to protect an ant .  
 Person1:        He is so humorous . 

informal