Our records are keyed by comment ID; we don't store your name or Facebook ID, so we can't look you up by name. To have your data deleted:
If you don't do anything, the record is deleted automatically 180 days after the message was sent. Either way, log entries are deleted after 30 days and backups after 35 days.
To delete the Messenger message itself, delete the conversation in Messenger. To delete your comment, delete it on Facebook.