When you sneeze, then say: All praises and thanks are to Allah. Your companion should say: May Allah...
Reference:Al-Bukhari 7/125.Hisnul Muslim 188
(الْحَمْدُ لِلَّهِ) (يَرْحَمُكَ اللَّهُ) (يَهْدِيكُمُ اللَّهُ وَيُصْلِحُ بَالَكُمْ)
When you sneeze, say: AlḥamdulillāhYour companion should say: YarḥamukallāhWhen someone says Yarḥamukallāh to you then you should say: Yahdīkumu ‘llāhu wa yuṣliḥu bālakum.
When you sneeze, then say: All praises and thanks are to Allah. Your companion should say: May Allah have mercy upon you. When someone says Yarḥamukallāh to you then you should say: May Allah guide you and set your affairs in order.