Believe in the power of a sincere prayer. Allah hears our every pleas and He will answer us at the best time. Have sabr. "...why you already look for entire forests when it was only yesterday you planted a tree?"
What we should say instead of a simple Thank You, and the person who this is said to should reply with Ameen.
Subhan Allah wa Alhamdu Lillahe Rab Al Aalameen wa La Illaha IlAllah wa Allahu Akbar