“We hope you that this holiday season finds you enjoying every single minute of it. We are aware that this is the time of the year everyone is looking forward to and we are no different from you in that regard. Since we hope to spend some quality time with our families and friends, holiday closure period is ahead of us. We hope that you will enjoy the holidays just as much as we will.
Thank them for their email. Even though you're not actually responding to the email, you still need to mind your Ps and Qs. After your greeting, add "Thanks for your email."

“The world is serious enough as it is - people need, and usually appreciate, an unexpected moment of levity in their day,” he says, when quizzed about how recipients might respond to such an OOO. He also confides that he himself has dispensed with auto responses altogether – though not for idealistic reasons. “The last time I tried to set one up, I botched it so badly that somehow it resent every single email in my outbox from the previous year - client emails, firing notices, literally thousands of emails.”
Dear [Customer name] Our store will be closed from [date] to [date] for Thanksgiving. We are assure you all of your emails will be answered once we are back on [date]. Kind regards, [Name/signature]