Abu Hurairah narrated that :
the Prophet (saws) said:
“One of you will be responded to, so long as he is not hasty, (and ) saying: ‘I supplicated, and I was not responded to.
Jami` at-Tirmidhi 3387
In-book : Book 48, Hadith 18
Man should always beg from Allah (swt) with confidence that He will hear him and grant his supplication as He is most merciful and kind to His servants.