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:       My goodness ! She is thirty seconds faster than the world record in 5000 metres race .  
 Person2:Excuse me , what did you say ?  
 Person1:        A Chinese girl has broken the world record in the Olympic Games .  
 Person2:That's incredible . I can't believe it .  
 Person1:        You have to . It is sure .  
 Person2:How amazing ! 

informal