Reading a worksheet with just
A:
B:
A:
B:Can be a little boring. What I do is plug the conversation into a comic strip maker. You can type in your conversation and you'll have characters with speech bubbles. For children, reading conversations with characters is much more entertaining than just a simple text worksheet.
There are a few simple comic strip makers on the net, or you could just make your own with clipart.
You can follow up with other worksheets to solidify grammar structures or practice vocabulary.
Happy teaching!