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:       Your search on this project has been excellent .  
 Person2:Thank you . I couldn ’ t have done it without the help of a strong team .  
 Person1:        The final report is exceptionally thorough and well done . I think that you have been come up with some interesting recommendations for the client .  
 Person2:Well , I hope the client feels the same way !  
 Person1:        I am sure they will be pleased . 

informal