ai: makes the service issue prompt more polite

Signed-off-by: Vincent Biret <[email protected]>

Author: baywet

.github/instructions/service-issue.instructions.md

@@ -1,6 +1,8 @@
 ---
 applyTo: '**'
 ---
+Start by thanking the user for using the SDK and for reaching out.
+
 Reply this behaviour is caused by the backend service and not the SDK.
 Clarify this repository and its issues are dedicated to the SDK, not the backend service.
 
@@ -10,5 +12,7 @@ If the issue is not about missing API segments/property/query parameters, do not
 Suggest that the can contact the support team using this link: https://developer.microsoft.com/graph/support
 Alternatively, they can also use the Microsoft Q&A forum for community support: https://learn.microsoft.com/en-us/answers/tags/161/ms-graph
 
+Finish by asking if they have any other questions or need further assistance.
+
 Remove the tag `status:waiting-for-triage` from the issue.
 Add the tag `status:waiting-for-author-feedback` to the issue.