"नेहा और जूलिया कल जायेंगी।"

Translation: Neha and Julia will go tomorrow.

[DHEESH101009]

जाऊँगा

[Gita-ji]

That is for a single person; Neha plus Julia is plural.
They are 'other people', i.e. 3rd person. This is for 'me', i.e. 1st person.