Answer:
Dialogue writing using modal verbs.
Step-by-step explanation:
Class President: Sir, may I speak with you? 
Principal: Yes, you may. What do you need to talk about? 
Class President: Sir, I would like to ask for your permission to organize and celebrate the upcoming Teacher's Day celebration. 
Principal: That's a great idea. But will you be able to organize it by yourselves, without help from the teachers? 
Class President: I think we can, Sir. We will form a committee that will focus on the event and form sub-committees on the class level to help contribute and other things. 
Principal: If you can manage to do that independently, that would be great. 
Class President: Thank you, Sir. We hope that we can do it successfully. 
Principal: If you can do that, it would also be a great event for your teachers. And I am happy to know that the students are thinking of celebrating their teachers. It is nice to know. 
Class President: Yes, Sir. So, shall I tell the other members that we can organize the event? 
Principal: Yes, do that. And let me know if you need any help. And you must make sure it is a successful event. 
Class President: Yes Sir. We will try to do that. Thank you, Sir. 
Principal: All the very best. And I hope you can make the necessary arrangements as you need. 
Class President: We will try. Thank you, Sir.