When you miss one detail, name it. "Could you repeat the street name?" is more efficient than a vague "What?" The speaker can return to the exact information you need.
Practice with a partner giving an appointment time and address. Partner: "Your appointment is at ten fifteen, at sixteen Park Road." You: "I heard the time. Was the building number sixteen or sixty?" This question shows what you understood and where the uncertainty remains.
Change the form when repetition is not enough
If the same sound remains unclear, ask for spelling or writing: "Could you spell the surname?" or "Would you mind sending the address in a message?" Hearing an identical sentence several times may not solve a problem with an unfamiliar name.
For instructions, check the sequence: "Do I sign the form before uploading it?" This is often more useful than asking the speaker to slow down through details you already understand.
End with a concise confirmation: "Thank you. Sixteen Park Road, at ten fifteen." Use only the information necessary for the task, particularly if personal details are being discussed in public. After practice, note whether you requested a sound, a meaning, or an action order. Recognizing that difference helps you choose the right repair phrase in the next real conversation.