The conversation between human and AI assistant.
How should I conclude an email to a professor?
That makes sense. Should I use "sincerely" or "best regards" as my closing phrase?
Either one is fine, but "sincerely" is more formal and might be a better choice in this case, since you're writing to a professor. You could also consider using "thank you" as your closing phrase to emphasize your appreciation for your professor's help.