Group by Concatenation of rows in sql server

Hi

I have tables like below

USER TABLE

_________________________________________________

ID   | Name  | Date

-----------------------------------------------------------

1| A |

2| A |

3| A |

4| B |

5| C |

6| C |

------------------------------------------------------------

AND ROLE TABLE

--------------------------------------------------

ID| ROLE

--------------------------------------------------

1| ADMIN

2| PRJ MGR

3| LEAD

4| ADMIN

5|  PRJ MGR

6| LEAD

and i want result like below

___________________________

NAME | ROLE

---------------------------------------------

A| ADMIN , PRJ MGR , LEAD

B| ADMIN

C| PRJ MGR, LEAD

i have used STUFF method but it concatenate the string if the id or unique value only in the same table not with other table

Thanks