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:       Sir , I am very glad to tell that we have successfully registered the trademark for our new product . It is the time to think of some effective promoting strategies . We are beginning to get more attention from overseas .  
 Person2:Well done , Fred . Do you know something useful for our promotion for our I-series ?  
 Person1:        OK , Let me see . I suppose we must strengthen our promotion , because our brand is still new to some consumers . Maybe we should start our advertising program with our local and overseas distributors simultaneously , because they stand on a better position for selecting the best ways to advertise in market places . Besides , the advertisement fund can encourage them to spend more attention on advertising our products .  
 Person2:That is a good idea to start with . I also think the mass media is also a good approach for advertising .  
 Person1:        Yes , the mass media has wider influence . One of my classmates works in an advertisement company . I can get help and inspiration from him . And we can also try some less expensive approaches of advertising , such as on-line sales . Personally , I prefer to the on-line sales , for it is cheaper , faster and wider . 

formal