Dear Sir or Madam,
I am writing to inform you that I cannot recommend customers to you because of some unexpected changes.
The regular customers are not available at present as the result of fierce competition over the marketing, even if we are devoting much time to building a steady relationship between customers and our company. The majority of customers are unavailable and out of the reach. Besides, the manager sent me to go aboard on business for one week, so I have no enough time to make connections with customers during these days. I will go back as early as possible after finishing my work.
Thank you for the mail of March 28. We can fully understand your situation and are sorry for putting you in a dilemma.
We acknowledge the mail of March 28. It is a pity that we can not get assistance from you. But we can fully understand your situation. Thank you all the same.