{
  "type": "function",
  "function": {
    "name": "search_flights",
    "description": "Search for available flights based on criteria",
    "parameters": {
      "type": "object",
      "properties": {
        "origin": {
          "type": "string",
          "description": "Departure city/airport code"
        },
        "destination": {
          "type": "string",
          "description": "Arrival city/airport code"
        },
        "departure_date": {
          "type": "string",
          "description": "Departure date in YYYY-MM-DD format"
        },
        "return_date": {
          "type": "string",
          "description": "Return date in YYYY-MM-DD format (for round trip)"
        },
        "trip_type": {
          "type": "string",
          "enum": ["one_way", "round_trip"],
          "description": "Type of trip"
        },
        "cabin_class": {
          "type": "string",
          "enum": ["basic_economy", "economy", "business", "first"],
          "description": "Preferred cabin class"
        },
        "passengers": {
          "type": "integer",
          "description": "Number of passengers",
          "minimum": 1,
          "maximum": 5
        }
      },
      "required": ["origin", "destination", "departure_date", "trip_type", "passengers"]
    }
  }
}