### What problem does this PR solve?
- Updated the dialog settings function to add a default prompt
configuration for no dataset.
- The prompt configuration will be determined based on the presence of
`kb_ids` in the request.
### Type of change
- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (Non-breaking change, adding functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):
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Co-authored-by: wenju.li <wenju.li@deepctr.cn>