search_cruise_lines
ChatGPTREQUIRED FIRST STEP: Search for cruise lines by name before calling search_cruises. Use this when: (1) user mentions a specific cruise line (e.g., "Royal Caribbean", "Carnival"), (2) user asks what cruise lines are available (e.g., "what cruise lines can I book", "which lines do you have"), (3) user wants to browse cruise lines (e.g., "show me cruise lines", "list cruise lines"). Returns matching cruise lines with IDs needed for search_cruises lineIds parameter.






