If this person who is arranging the bookings works in the hotel, and takes what he takes from the drivers with the knowledge of the hotel, and does not show favouritism to anyone, there is nothing wrong with that.
The shar i reservations with regard to this issue are two:
Gifts to workers - this refers to giving money to an employee without the knowledge of his employer], because of the report narrated by al-Bukhaari (7174) and Muslim (1832) from Abu Humayd as-Saaidi (may Allah be pleased with him) who said: The Prophet (blessings and peace of Allah be upon him) appointed Ibn al-Lutbiyyah, a man from Banu Azd, in charge of collecting the zakaah. When he came he said: This is for you, and this was given to me. The Prophet (blessings and peace of Allah be upon him) stood up on the minbar and praised and glorified Allaah, and said: What is the matter with an agent whom I send, and he comes to me and says, This is for you and this is for me'? Why doesn't he sit in the house of his father and mother and see if he is given anything or not? By the One in Whose hand is the soul of Muhammad, no one of you gets anything (by way of such gifts), but he will bring it on the Day of Resurrection, carrying it on his shoulders, whether it is a groaning camel, a lowing cow or a bleating sheep. Then he raised his arms until we saw the whiteness of his armpits, then he said: Have I conveyed (the message)? two or three times.
Ahmad and al-Bayhaqi narrated that the Prophet (blessings and peace of Allah be upon him) said: Gifts given to workers are a betrayal. This hadeeth was classed as saheeh by al-Albaani in Saheeh al-Jaami, no. 7021.
These gifts are intended to make things easier or to make (workers) overlook mistakes and errors, or to make them like the giver and give him precedence over others. Islam forbids all of that so as to block the means that lead to corruption. But if that happens with the knowledge of the employer, this reservation no longer applies.
Bribes. This refers to money given to undermine or deny rights and support false claims, or what a person pays in order to take something he has no right to take, or to evade a duty or obligation.
See: al-Mawsooah al-Fiqhiyyah, 24/256; al-Hawaafiz at-Tijaariyyah, p. 119
Shaykh Ibn Baaz (may Allah have mercy on him) said: Ibn Aabideen (may Allah have mercy on him) said in his Haashiyah: A bribe is that which a person gives to the judge etc. so that he will rule in his favour, or so as to make him do what he wants. It is clear from this description that there is more to a bribe than money or benefits that one may acquire by means of it. What is meant by the judge etc. is the judge and anyone else through whom the one giving the bribe hopes to influence to serve his own interests, whether he is one of the officials or employees of the state or those who work in the private sector, such as agents who work for companies, owners of real estate and so on. What is meant by ruling in the favour of the briber and making the recipient of the bribe do what the giver wants is: fulfilling the wishes and aims of the giver of the briber, whether that is lawful or otherwise.
End quote from Majmoo Fataawa Ibn Baaz, 23/223.
And Allah knows best.
Reproduced from Islam QA