Added OpenAPI docs using nelmioAPIDocBundle.

src/Response/BookingCreateResponse.php

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+<?php
+
+namespace App\Response;
+
+use OpenApi\Attributes as OA;
+
+class BookingCreateResponse
+{
+    #[OA\Property(description: 'Booking reference number')]
+    public string $refNumber;
+}

src/Response/SearchAvailabilityResponse.php

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+<?php
+
+namespace App\Response;
+
+use OpenApi\Attributes as OA;
+
+class SearchAvailabilityResponse
+{
+    #[OA\Property(description: 'Room category ID')]
+    public string $roomCategory;
+
+    #[OA\Property(description: 'Number of available rooms')]
+    public int $availability;
+}

src/Response/SearchFareCategoryResponse.php

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+<?php
+
+namespace App\Response;
+
+use OpenApi\Attributes as OA;
+
+class SearchFareCategoryResponse
+{
+    #[OA\Property(description: 'Number of guests')]
+    public int $guestNumber;
+
+    #[OA\Property(description: 'room price')]
+    public int $price;
+}