I have voted to close this as "off-topic" because we aren't a proof reading service, however, because I sympathize with how hard it can be to obtain resources as a beginner, I will correct it and explain why certain corrections are needed. Therefore, even if it is closed, you will have some help. I recommend using the bonpatron website for corrections. It is free. If you are willing to spend money, Antidote is a much better program.
B: Bonjour! comment ca va?
A: je vais bienne, et toi?
B: moi aussi, ca va bienne. ou etiez-tu?
A: j'etais dans l'universite.
A: Cinq heures et demis de l'apres-midi.
Corrections (in bold):
Note that each correction will have a number in parenthesis at the end of each correction. Use this as a footnote to refer to my notes which come after the text.
A: Bonjour !(1)
B: Bonjour !(1) comment ça(3) va ?(1)
Je(2) vais bien(4), et toi ?(1) Ça va bien, et toi ?(5)
B: Moi(2) aussi, ça(3) va bien(4). Où(2)(3) étais(3)(4)(6)-tu ?(1)
A: J'étais(2)(3) à(7) l'université(3).
B: Quand ?(1)
A: Cinq heures et demie(4) de l'après(3)-midi.
B: Salut (4) ! (1)
A: Salut (4) ! (1)
- When writing international Standard French, a space is required in between the word and an exclamation/question mark.
- Capitalization is necessary here. Sometimes it is not after an exclamation mark in French. See this link for rules.
- You have left out the accent needed for various letters. This becomes a spelling error.
- These words were spelled incorrectly. Look them up in a dictionary if you are unsure.
- I corrected what you wrote but crossed it out because one would normally not respond with je vais bien to comment ça va. This response is more normal for comment vas-tu.
- Incorrect verb conjugation choice. Use Verbix.com for online conjugations of verbs if you don't have a bescherelle.
- Incorrect use of preposition. Here is a link with lessons for this.