/// <summary>
/// Start a new dining service in a specified venue area, if one does not already exist.
/// If the area already has an active service, this should fail.
///
/// Assumes that the database object will throw the error that an active service exists.
/// </summary>
/// <param name="managerId">Manager ID</param>
/// <param name="venueId">Target venue ID</param>
/// <param name="areaId">Target area ID</param>
/// <returns>The created dining service document</returns>
public async Task <DiningServiceDocument> StartDiningService(string managerId, string venueId, string areaId)
{
// Ensure the manager has access to the given service.
await _EnsureManagerCanAccessVenue(managerId, venueId);
// Start a new dining service and return it.
return(await _database.StartDiningService(venueId, areaId));
}