Dear ______,
Greetings of the day!
This email is to inform that the company office __________ (office name and address) will not be operational on __/__/_____ (date) on the occasion of ________ (occasion).
The office will be reopening on __/__/____ (date). All the pending orders will be processed from the operational day onwards. The inconvenience caused is deeply regretted. In case of need, do not hesitate to contact me at any time.
Thanks & Regards,
__________ (Name),
__________ (Designation),
__________ (Contact details)