My employee is not comming to work and asking me...

, repeated absence from work for a period of seven consecutive days or twenty separate days gives the employer the right to dismiss the worker while depriving him of the end of service bonus.
Here is the text of the UAE labor law, related to your inquiry:
Article (120)
which states that employer may dismiss a worker without notice if and only if the worker:
1. Assumes a false identity or nationality or submits forged certificates or documents.
2. Is engaged on probation and is dismissed during or at the end of the probationary period;
3. Commits a fault resulting in substantial material loss to the employer, provided that the latter notifies the labor department of the incident within 48 hours of his becoming aware of its occurrence;
4. Disobeys instructions on the safety of work or workplace, provided that such instructions are in writing and posted at a conspicuous place and are communicated verbally to the worker, in case he is illiterate;
5. Defaults on his basic duties under the contract and fails to redress such default Despite a written interrogation and a warning that he will be dismissed if such default is repeated;
6. Is finally convicted
7. Reveals any confidential information of his employer;
8. Is found in a state of drunkenness or under the influence of a narcotic drug during working hours;
9. Assaults the employer, the manager in charge or any of his workmates during working hours; or
10. Absents himself from work without a valid reason for more than 20 no successive days in one single year, or for more than seven successive days.