Is this a valid text or is it phishing?

Hi Xxxxxx, it's Xfinity Assistant. We've identified an issue that may affect your Xfinity Internet and Video services at xxxxxxxxx. A technician will need access to your home to fix the issue.  Please schedule a free technician appointment. 1 - Yes, let's schedule 2 - Not right now  Txt help or stop Msg&DataRatesMayApply