Rejoice in the Lord always; again I will say, Rejoice. Let your reasonableness be known to everyone. The Lord is at hand; do not be anxious about anything, but in everything by prayer and supplication with thanksgiving let your requests be made known to God. And the peace of God, which surpasses all understanding, will guard your hearts and your minds in Christ Jesus. Philippians 4:4-7
Here there is also the word requests, in my opinion supplication is more than just requesting or asking the Lord.
I believe there are critical times when our requests can and should become a contrite earnest pleading to the Lord for mercy, for deliverance, for guidance, for healing, for justice, for provision, for changing our heart, for strength in a rough way, for love to our enemies, etc.
We all face times when to cast our anxieties before the Lord will not just be a serene conversation, there are times we can’t help but to cry before the Lord.
And shall not God avenge his own elect, which cry day and night unto him, though he bear long with them? Luke 18:7