Sir/Madam,
This email is in reference to the telephonic conversation made on date __/__/______ (date). I would like to sincerely request you for an office visit to discuss the project further. I believe that we could discuss the project over a meeting.
Kindly, approve my request for office visit and it would be highly appreciated if you could arrange the meeting at around __:__ (time) and confirm the same. You can always feel free to contact me at ________ (contact details).
Regards,
_____________ (Name),
_____________ (Contact details)