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When someone says the first phrase to you, reply with the second:
بَارَكَ اللَّهُ فِيكَ. وَفِيكَ بَارَكَ اللَّهُ
Barakallahu fik. wafika barakallah
“May Allah bless you.” — “And may Allah bless you too.”
Source as cited by the compiler Ibn as-Sunnī ('Amal al-Yawm wa'l-Laylah) p. 138 no. 278; see Ibn al-Qayyim, al-Wābil aṣ-Ṣayyib p. 304 (ed. Bashīr ʿUyūn)