Letter to manager for time off work

Dear Victor.
I need a few hours away from my work. The reason for this absence is connected (due?) to a visit to the insurance company.
You know, I’ve got an accident and I have to bring some documents for registration of insurance payment. Unfortunately, my insurance case may be considered only one time a week on Mondays from 9 a.m. till midday, so I need at least 2 hours off to sort it out.
My colleague (opposite number?) Alex will back me up and respond both feedback and probably complaints of our clients. He is a hard-working coworker so I did not see another employee to execute my specific tasks.

Dear Victor,

(If possible) I would like a few hours off from work. The reason for my absence is because I have to visit the insurance company. As you know, I had an accident and I have to take some documents to enable the registration of the insurance payment. Unfortunately, my insurance case can only be considered once a week on Mondays from 9am till midday, so I need at least 2 hours off to sort it out. My colleague Alex will cover me and respond to both any feedback or complaints from our clients. He is a dedicated worker, who will do the job, as I do not see any other employee able to do these tasks while I am absent. 

Great job with the writing. Very thorough letter.