Hi, I do not know how long should the dialogue be, but I hope this helps you. 
 You: Hi there! Children’s day is around the corner. 
 Friend: Yes! How can we better celebrate it? 
 You: What about visiting the children living in a slum area near our school? 
 Friend: Oh yes! That would be a great idea! Then maybe we can have a small celebration and share a meal with them? 
 You: That’s exciting! Should we tell it to Teacher Anna? 
 Friend: I think it would be best if we approach the Principal for this. She has the authority to approve or reject. 
 You: Yes, that’s right, and maybe she can add more ideas to this plan. 
 Friend: Shall we go now? 
 You: Yes! Let’s go!