I simply changed Macaroniross' powerpoint to be more focused on greetings instead of feelings for my special needs, but would work for 1st grade as well! It has three scenarios of characters greeting and introducing themselves in example conversations.
Hello / Good Morning / Hi
My name is ____.
Nice to meet you. / too.
Optional: For practice I have popular character cut outs that I will put on the board for students to introduce. This could also be added in the powerpoint but personally I find that I need to switch between screen and physical objects to keep students' attention.
Files: