Llevo el comprobante de reserva.

Llevo is the first-person singular present tense of llevar.

• yo llevo = I carry / I bring / I have with me
• infinitive: llevar

So the sentence uses the normal present-tense yo form, even though yo itself is not written.

It can mean all of those, depending on context.

With Llevo el comprobante de reserva, a native speaker will usually understand something like:

• I have the reservation document with me
• I’m bringing the reservation confirmation
• I’m carrying the reservation proof

This is very common in Spanish: one verb covers several meanings that English often separates.

A useful way to think about llevar here is:

• llevar = to have on you / to take along / to carry

So in this sentence, it sounds very natural.

Because Spanish usually omits subject pronouns when the verb already makes the subject clear.

• llevo already tells us the subject is I
• so Yo llevo el comprobante de reserva is possible, but usually unnecessary

You would add yo only for emphasis, contrast, or clarity, for example:

• Yo llevo el comprobante, pero ella lleva los pasaportes.

In normal speech, Llevo el comprobante de reserva is the more natural default.

Comprobante is a very common Latin American word for a document that proves something.

Depending on context, it can mean:

• proof
• receipt
• voucher
• confirmation document

In this sentence, comprobante de reserva means something like:

• reservation confirmation
• proof of reservation
• booking document

It does not always mean a cash-register receipt. It is broader than that.

In travel or hotel contexts in Latin America, comprobante is very natural.

In Spanish, de + noun is often used to create a kind of label or category.

So:

• comprobante de reserva = reservation confirmation / reservation proof

Here, reserva works almost like a classifier telling you what kind of document it is.

If you say de la reserva, that sounds more specific:

• el comprobante de la reserva = the proof/confirmation of the reservation

Both can be possible, but they are slightly different in feel:

• de reserva = a standard type of document
• de la reserva = tied to a specific reservation already being discussed

El means the speaker is referring to a specific reservation document.

• Llevo el comprobante de reserva = I have the reservation confirmation
  You and the listener probably both know which one is meant.

If you said un comprobante de reserva, it would mean:

• I have a reservation confirmation
• one such document, less specific

In many real situations, the definite article makes sense because there is one particular booking document involved.

No. It is natural, but there are other common ways too.

Depending on the country or situation, people might also say:

• Llevo la confirmación de la reserva.
• Traigo la confirmación de la reserva.
• Tengo el comprobante de la reserva.

Possible differences:

• comprobante sounds a bit more like proof/document
• confirmación sounds more like the confirmation itself
• tengo focuses on possession
• llevo focuses on having it with you / bringing it along

So your sentence is good and natural, especially in formal or travel-related contexts.

This is a very common question.

Both can work, but the point of view is different:

• llevar often focuses on taking/carrying
• traer often focuses on bringing something toward the place or person you’re speaking to

So:

• Llevo el comprobante de reserva = I have it with me / I’m taking it along
• Traigo el comprobante de reserva = I’m bringing it (here)

In many everyday situations, especially in Latin America, the difference is not always dramatic, but the core idea is still useful.

If you are arriving somewhere and showing that you brought the document, traigo may sound especially natural. If you are simply saying you have it on you, llevo is very natural.

Yes, but the meaning shifts slightly.

• Tengo el comprobante de reserva = I have the reservation confirmation
• Llevo el comprobante de reserva = I have it with me / I’m carrying it / I’m bringing it

So:

• tengo emphasizes possession
• llevo emphasizes possession plus movement or accompaniment

If you want to make clear that the document is physically with you, llevo is often better.

Yes. In travel, hotels, restaurants, and bookings, reserva is the standard word for reservation in Spanish.

Examples:

• Tengo una reserva para dos personas.
• La reserva está a nombre de García.

Spanish reserva can also mean reserve in other contexts, but in this sentence the travel/booking meaning is completely clear.

Yes, but the original order is the most neutral and natural.

• Llevo el comprobante de reserva. = normal, neutral
• El comprobante de reserva lo llevo yo. = more emphatic
• Llevo conmigo el comprobante de reserva. = adds with me, for extra clarity

Spanish word order is more flexible than English, but the basic version is the one learners should remember first.

The pronunciation of ll varies by region.

In much of Latin America, llevo sounds roughly like:

• YEH-bo
• or in some regions, something closer to JEH-bo or SHEH-bo

A few key points:

• ll is often pronounced like English y
• v in Spanish is usually pronounced very similarly to b
• the stress is on the first syllable: LLE-vo

So a broad Latin American learner-friendly approximation is YEH-bo.