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:       Office software like Windows might be one of the best inventions in this information age . It saves us from so much work and makes the communication even around the world much easier .  
 Person2:Fully agree . I do enjoy the convenience though I am still a beginner in using Excel . The latest office equipment is more type-functional . It combines fax machine , copy machine and printer in one . It saves a lot of place one machine instead of three .  
 Person1:        Yes , this machine is even smaller than those before .  
 Person2:When will we get one of those ?  
 Person1:        You know our boss always trying to save the last penny . We have to use up the equipment first . 

formal