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!