Thank you for considering me for the position of [Position Name] at [Company Name]. I greatly appreciate you inviting me for an interview on [Date] at [Time]. Unfortunately, I have to cancel our interview as I have decided not to pursue this opportunity with [Company Name] further. Please accept my sincerest apologies for the inconvenience.

I am grateful to you for having given me your time and sincerely hope that you find a good candidate for the position.

Thank you.

Kind Regards,

[Your Full Name]
[Contact Details]