diff --git a/.github/workflows/workflow-ci.yaml b/.github/workflows/workflow-ci.yaml
index c73995b..3b79ee2 100644
--- a/.github/workflows/workflow-ci.yaml
+++ b/.github/workflows/workflow-ci.yaml
@@ -83,8 +83,18 @@ jobs:
 
           # request two reviewers from OWNERS file randomly
           PR_NUMBER=${{ github.event.pull_request.number }}
-          REVIEWERS=$(yq '.reviewers[]' OWNERS | grep -v "^$AUTHOR$" | shuf | head -n 2 | paste -sd ",")
-          gh pr edit $PR_NUMBER --add-reviewer $REVIEWERS
+          REVIEWERS=$(
+            yq -r '.reviewers[]' OWNERS \
+              | sed 's/^[ \t]*//;s/[ \t]*$//' \
+              | tr -d '\r' \
+              | grep -v "^${AUTHOR}$" \
+              | shuf \
+              | head -n 2 \
+              | paste -sd ","
+          )
+          if [ -n "$REVIEWERS" ]; then
+            gh pr edit $PR_NUMBER --add-reviewer "$REVIEWERS"
+          fi
 
   # Work for issue & PR, ignore update for now
   on-new-comment:
@@ -167,13 +177,11 @@ jobs:
               # Handle hold command
               # hold/unhold the PR immediately in case of unexpected auto-merge.
               elif [[ "$COMMENT_LINE" =~ ^/hold ]]; then
-                if [[ "$LABEL" =~ ^cancel ]]; then
-                  gh pr edit $ISSUE_NUMBER --remove-label do-not-merge/hold
-                  echo "Remove label: do-not-merge/hold"
-                else
-                  gh pr edit $ISSUE_NUMBER --add-label do-not-merge/hold
-                  echo "Add label: do-not-merge/hold"
-                fi
+                gh pr edit $ISSUE_NUMBER --add-label do-not-merge/hold
+                echo "Add label: do-not-merge/hold"
+              elif [[ "$COMMENT_LINE" =~ ^/unhold ]]; then
+                gh pr edit $ISSUE_NUMBER --remove-label do-not-merge/hold
+                echo "Remove label: do-not-merge/hold"
 
               # Handle cc
               # Can not require review from the author.
@@ -462,4 +470,4 @@ jobs:
           if [[ "$LABELS" == *"lgtm"* && "$LABELS" == *"approved"* && "$LABELS" != *"do-not-merge"* ]]; then
             gh pr merge $PR_NUMBER --squash
             echo "Auto merged"
-          fi
+          fi
\ No newline at end of file