This is what I wrote in the email.
Dear Case Officer,
I am sending this email to get an update on my application which I submitted for Canada Permanent Residency on October 24, 2018 – Skilled Worker Category (Online application – Express Entry). I have exceeded the normal processing time as I have completed the 6 month's timeline. I logged in my express entry profile and there is no update after my medical exam was passed. Kindly check and update me regarding my application. I would be grateful to provide you with any other/additional information, if required.
mention your UCI ID , name, Email address , date of Birth and EE application number which starts with E and phone