Hashem heard my prayers and sent the American man to assist me. I did not rely on the man, but rather on Hashem. It is important to remember that ultimately, all our needs are provided by Hashem, and we should turn to Him in prayer in times of need.
He is the one who arranged for this wealthy person to be His messenger. Why would I need his address? It is not he who provided me with the needs for yom tov. It was Hashem Himself.
For all our needs in life we turn only to Hashem. Every day, every hour, and in every situation, Hashem is the address where we send our tefillos.