Learn Turkish: Otelde rezervasyon yaptım. - I made a reservation at the hotel.

The verb yapmak means to do or to make. Turkish often combines a noun with a helper verb like yapmak or etmek to create an action. Here, rezervasyon yapmak literally means to make a reservation.

Why doesn't rezervasyon have an accusative suffix like rezervasyonu?

We leave off the accusative suffix when the object is indefinite, meaning a reservation rather than the reservation. If you wanted to say I made the reservation (referring to a specific one you already discussed), you would add the suffix and say rezervasyonu yaptım.

Could I use a single Turkish verb for to book?

Yes, you can use the verb ayırtmak (to reserve or book). For example, Otelde yer ayırttım means I booked a place at the hotel. However, using the French loanword rezervasyon with yapmak is extremely common in daily life.

Why is the suffix -de used in otelde instead of otele?

The -de suffix is the locative case, which tells us where something happens (in, on, or at). Otelde simply means at the hotel. If you were talking about movement toward the hotel (like going to the hotel), you would use the dative case -e and say otele.