Support.apple.com/en-au/Ts4515

This isn't a chat session. It may take a while before someone answers. You lost/forgot your iCloud ID?

See if you can recover the ID/password.

Apple ID - How to find your Apple         An iCloud e-mail address is an Apple ID.

Apple ID - Find

Enter the Apple (iCloud) ID and click Forgot Password.

Apple ID - Manage

Apple ID – Forgot Password