When something happened that pleased him, the Prophet (ﷺ) used to say:
Alḥamdu lillāhi ‘lladhi bi ni`matihi tatimmuṣ-ṣāliḥāt.
And if something happened that displeased him, he used to say:
Alḥamdu lillāhi `alā kulli ḥāl.
When something happened that pleased him, the Prophet (ﷺ) used to say:
Praise is to Allah Who by His blessings all good things are perfected.
And if something happened that displeased him, he used to say:
Praise is to Allah in all circumstances.
Reference:
Ibn As-Sunni, 'Amalul-Yawm wal-Laylah, and Al-Hakim who graded it authentic
1/499. See also Al-Albani, Sahihul-Jami' As-Saghir 4/201.