Customer just says hi, no issue stated:

- Hi, this is Ann from T-Mobile, how may I help you?  

Customer with a Problem:

- Hi, this is Ann from T-Mobile, I’m here to help. Let’s partner together to get this resolved.  

Customer with a basic Inquiry:
 
- Hi, this is Ann from T-Mobile, I’m happy to help take care of XXXX  for you.  (move forward statement)  

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CLOSING 

Closing Customer Issue resolved: 

- Thank you in giving us a chance to get this taken cared for you as T-Mobile will always be happy to know that our customers able to enjoy our services. 

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Closing additional assistance:

I just want to make sure I don't miss a thing! Aside from this, would there be anything else that I can help with? Just wanted to make sure that everything is covered. 

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Just a recap, 

- We are part of T-Mobile and I hope that whenever you think about T-Mobile, you will always think about your conversation with us. 

- Awesome! So happy we were able to help. Have a great rest of your day!