public async Task <ActionResult> GenerateQuotation([FromBody] QuotationDto quotationRequest)
        {
            // We can move the input validation into QuotationService
            // and give more error detail, for example invalid email etc.
            if (quotationRequest == null ||
                string.IsNullOrWhiteSpace(quotationRequest.FirstName) ||
                string.IsNullOrWhiteSpace(quotationRequest.LastName) ||
                string.IsNullOrWhiteSpace(quotationRequest.FromCurrencyCode) ||
                string.IsNullOrWhiteSpace(quotationRequest.ToCurrencyCode) ||
                quotationRequest.Amount <= 0 ||
                (!string.IsNullOrWhiteSpace(quotationRequest.Email) && !RegexUtilities.IsValidEmail(quotationRequest.Email)))
            {
                return(BadRequest());
            }

            return(Ok(await _quotationService.GenerateQuotation(quotationRequest)));
        }