Ukipata nafasi, nitumie ujumbe wa sauti.

It has three main parts:

• u- = you
• -ki- = if/when
• -pata = get, find, obtain

So ukipata means if you get or when you get.

It can mean either, depending on context.

In a sentence like Ukipata nafasi, English could naturally be:

• If you get a chance
• When you get a chance
• When you have time

Swahili often leaves that distinction a little broader than English does.

Yes, nafasi can mean space, room, position, or opportunity.

In this sentence, kupata nafasi is a very common expression meaning:

• to get a chance
• to have time
• to be available

So here it does not mean physical space. It means opportunity/time.

Because nitumie means send me.

A simple command like tuma means send.
But here the speaker wants to say send to me / send me, so Swahili uses ni- for me inside the verb.

Also, the ending -e is a common request/subjunctive form in Swahili, especially after an if/when clause like Ukipata nafasi.

So:

• tuma ujumbe = send a message
• nitumie ujumbe = send me a message

Here it means me.

That is a very common beginner question, because ni- can also be related to I in other forms. But in nitumie, it is the object marker meaning me.

So nitumie does not mean I should send.
Here it means send to me / send me.

They are built into the verbs.

• In ukipata, u- means you
• In nitumie, ni- means me

Swahili often puts pronouns inside the verb instead of using separate words.

That is why the sentence does not need separate words for you and me.

Literally, it is something like message of voice/sound.

• ujumbe = message
• sauti = voice or sound
• wa = a linking word, often like of

So ujumbe wa sauti is the normal way to say voice message.

Because the linking word has to agree with the noun before it.

In Swahili, words like of change form depending on the noun class of the noun they follow. Here, ujumbe takes the connector wa, so you get:

• ujumbe wa sauti

This kind of agreement is very normal in Swahili grammar.

Swahili does not use articles the same way English does.

There is no separate word exactly like a/an/the in this sentence.
So ujumbe wa sauti can mean:

• a voice message
• the voice message
• just voice message

The exact sense comes from context.

Yes. It already sounds fairly polite and natural.

Starting with Ukipata nafasi softens the request a lot, because it is like saying:

• when you have a moment
• if you get a chance

If you want to make it even more explicitly polite, you can add tafadhali:

• Ukipata nafasi, tafadhali nitumie ujumbe wa sauti.

That would be If you get a chance, please send me a voice message.