Is my work as a hotel reservation coordinator for Saudi and Arab tourists permissible in Islamic law, given my fear that they may commit sins during their travels?

It is permissible to work in coordinating hotel bookings inside and outside the Kingdom, unless it is known or highly probable that the client's travel is for disobedience (sinful purposes), or if the hotel is known for evil and corruption. In these cases, it is forbidden to cooperate in sin and aggression, as Allah Almighty says: (And cooperate in righteousness and piety, but do not cooperate in sin and aggression). However, if it is neither known nor highly probable that his intention is disobedience, then there is no harm in assisting him, and the sin falls upon him alone if that was his intention.