How do you politely ask (in Spanish) for a Spanish speaker to talk more slowly?

I’m from the United States and sometimes when I start speaking Spanish, I have a hard time following along with their response.

I know it understanding oral Spanish with more practice and studying, but in the moment, what should I say?

For example, if I’m trying to help someone in a store and they only speak Spanish, I still want to help them the best that I can.

I want to say something like, “I think I know what you’re saying, but I’m still learning Spanish. Can you please talk more slowly or explain in another way?”

Also, in general, for this kind of circumstance…

Would I use the conditional (¿Hablaría más despacio?)— or is this kind of awkward and an English-y way to ask?

Would I use a command? (Hable más despacio por favor)

Thank you in advance!