This is the 16620th most frequent Turkish word.
yolcuya
"To the passenger" or "for the passenger."
Here, 'yolcuya' is in the dative case, used with 'ait' to indicate possession or relation to the passenger.
Yolcuya ait valiz kayboldu.
The luggage belonging to the passenger was lost.
In this sentence, 'yolcuya' is in the dative case and is used to indicate that the action of offering is directed to the passenger.
Yolcuya bir şişe su teklif ettim.
I offered the passenger a bottle of water.
Here, 'yolcuya' is in the dative case and is used to specify the direction towards the passenger.