Speak out loud after each line. Using your mouth builds muscle memory. Record yourself if you can.
Dialogue
Pharmacist: Hello! How can I help you today?
Customer: Hi! My feet hurt. I need something for pain.
Pharmacist: I see. We have a cream and some tablets. Which do you prefer?
Customer: I want the cream, please. I like to use a chunk of cream.
Pharmacist: Okay, here is the cream. It will help you settle the pain.
Customer: Thank you! I hope it works well.
Pharmacist: You’re welcome! Have a good day!