The Prophet (ﷺ) asked Allah this way:
اَللَّهُمَّ إِنِّي أَسْأَلُكَ عِيْشَةً نَقِيَّةً وَمِيْتَةً سَوِيَّةً وَمَرَدًّا غَيْرَ مُخْزٍ وَلَا فَضِحٍ
Transliteration
Allaahumma inni as'aluka ‘ishatan naqiyyatan, wa mitatan saweyyatan wa maraddan ghaira mukhzin wala fadi'hin
Translation
O Allah! I ask You for a pure living, an easy death and a return that is not shameful or disgraceful!
Allahumma aḥini mā kānatil-ḥayatu khayran lī wa tawaffanī idhā kānatil-wafātu khayran lī. You're asking Allah to pick what's best - life or death. You trust His mercy.
Allāhumma ighfir li (name of the person) warfa' darajatahu fil-mahdiyyīna, wakhlufhu fī 'aqibihi fil-ghābirīna, waghfir lanā wa lahu yā Rabbal-'ālamīna, wafsah lahu fī qabrihi wa nawwir lahu fīhi. Ask Allah to forgive them and honor them.
Allāhumma in kāna hādhā al-amr khayran lī faqdurhu lī wa yassirhu lī thumma bārik lī fīhi. You ask Allah to make things easy and blessed if it's good for you.
Allāhumma innī as'aluka min faḍlika wa raḥmatika, fa'innahu lā yamlikuhā illā anta. Ask Allah for His kindness and good things. It's a strong and simple dua.
Allāhumma bārik lanā fī mā razaqtanā wa qinā 'adhāb an-nār. Ask Allah to bless what He gives you and keep you safe from fire. Muslims say it daily.