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 disposable contact lenses . They're great for camping !  
 Person2:Cool ! Each contact comes in its own saline solution ?  
 Person1:        Yep . They're prescription contacts with UV protection .  
 Person2:Wow ! How high-class ... a new pair for each day ...  
 Person1:        You just pop'em in in the morning , take them out at night , and then throw them away . No cleaning !  
 Person2:Cool . So are you near-sighted or far-sighted ?  
 Person1:        Near sighted . 

formal