Notes

Apology:-
I apologize for the inconvenience. Let me help you right away with your issue.

I really apologize for all past bad experience. This is not the experience we want to deliver. Please allow me a chance to once to overturn the situation. I will try my best to resolve this and get everything sorted for you.
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For internet:-
I am sorry your internet is not working. I know that can be frustrating. I will be glad to help you resolve this issue.

I completely understand your situation as I am also a customer at some point, I am working from home and my daughters are doing online schooling, we also totally depend upon Internet to work. You have reached to right agent. I will help you with nest possible resolution on chat.

I completely understand your situation as I am also a customer at some point, I am working from home and my daughters are doing online schooling, we also totally depend upon Internet to work. I know how difficult it is when you Internet speed is slow, let me check the device and help you to get the proper speed.
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For cable:-
I apologize for the inconvenience. I can understand the importance of running cable as it is a world of entertainment and I have kids at home and know importance of cable as it's the important source of entertainment for them. You have reached to right agent. I will help you with nest possible resolution on chat.
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Assurance:-
No worries, I'm here to help you and be rest assured as I'll make sure that your concern is addressed properly over this chat which would probably change your mood as well.

I know how it feels when things are not working the way it should be however please be assured as I will give my best efforts to get it fixed for you at the earliest on priority.

Thank you for bringing this to our concern. Let me quickly check it and help further to get this resolved.
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Business:-
You are a valuable customer, I would like to appreciate your business and loyalty with comcast.
(IF CUSTOMER IS NEW)
Let me take this opportunity to welcome you to Xfinity family. Thank you so much for choosing Comcast to be your service provider. We are so grateful to have you and we value your business.

Thank you for being a valuable customer for such a long time. I'd like to say thank you for your loyalty, for being our customer and for choosing Xfinity. We really could not be doing this without you.
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Appreciation:
I highly appreciate your time and patience over the chat.
I highly appreciate your efforts over the chat.
Thank you for being my hand and eyes, it was possible only because of your efforts.
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SELF HELP
I must tell you that we have an amazing App that is called 'Xfinity App" using this App you can you can manage the technician ( cancel or reschedule ) you can also try to fix internet issue, check for service outages, arrange call back, pay bills, and manage your account online, we have 'Self-help videos' available as well. It also keeps you notified about any kind of alerts such as outage, Comcast Service Center locations and many more. I would strongly recommend you to download and use it.
You can download it at http://xfinity.com/apps. You can enter your Xfinity username and password as login credentials for it.
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BAXA:-
Meanwhile as an alternate you can also use Xfinity Stream application.
With Xfinity stream you can take your entertainment with you, anywhere and everywhere you go and Enjoy top networks and live sports on the go, and get your entire channel lineup on any screen at home.
You can download the Xfinity Stream app for free from the Apple App Store or Google Play and all you require is Xfinity ID to login.
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Meanwhile I would also like to inform you that during the service interruption, as an alternative you can also access Xfinity Hotspot.
All you have to check the hotspot location map online at wifi.xfinity.com or download the Xfinity WiFi Hotspots app from the App Store or the Google Play store.
After downloading the Xfinity hotspot app or visiting the link you need to click on the 'Find a hotspot" tab and enter address, city, state or ZIP code to find a nearby hotspot.
There will be no charges for you to use it and it is free of cost with Xfinity internet service. All you have to do is to connect using your XFINITY user name and password.
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Great! I appreciate any feedback on the service and experience I have provided you today. Thankyou for being a loyal Xfinity costumer. I hope you have an amazing rest of your day.