/// Finds and returns a message, if any, who has the specified <paramref name="messageId"/>.
/// </summary>
/// <param name="messageId">The message ID to search for.</param>
/// <returns>
/// The <see cref="Task"/> that represents the asynchronous operation, containing the user matching the specified <paramref name="messageId"/> if it exists.
/// Gets the message identifier for the specified <paramref name="message"/>.
/// </summary>
/// <param name="message">The message whose identifier should be retrieved.</param>
/// <returns>The <see cref="Task"/> that represents the asynchronous operation, containing the identifier for the specified <paramref name="message"/>.</returns>
/// Finds and returns a message, if any, who has the specified <paramref name="messageId"/>.
/// </summary>
/// <param name="messageId">The message ID to search for.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> used to propagate notifications that the operation should be canceled.</param>
/// <returns>
/// The <see cref="Task"/> that represents the asynchronous operation, containing the message matching the specified <paramref name="messageId"/> if it exists.