Most massage therapists are able to help you with non-specific back stretches, however, more advanced stretching advice would be out of scope of practice. I know this is not the means for a longer description of your problem, however you don't mention whether the pain is in your lower or upper back nor do you mention whether that pain is a result of an injury, bad posture or any other cause. This information would be needed by a massage therapist in order to be able to tailor their advice to your specific needs.
I hope this helps.