Respected Sir Madam,
This is to most humbly inform you that I am writing this email to request you to change my working hours as ____________ (mention reason – not able to manage time /personal reasons/others)
My current working hours are __:__ (time) till __:__ (time) and I would prefer to change working hours from __:__ (time) to __:__ (time). Kindly consider this email a genuine request.
I understand all of the responsibilities I am offered to look after and I ensure that this change won’t be affecting the work output from my end. I shall be obliged if you could consider approving my request.
Yours truly,
__________ (mention name),
__________ (mention designation)