Informal:
* Veux-tu sortir avec moi? (Do you want to go out with me?)
* Tu veux bien me donner un rendez-vous? (Would you be willing to give me a date?)
* On peut se voir? (Can we see each other?)
Formal:
* Accepteriez-vous de me donner rendez-vous? (Would you accept to give me a date?)
* Seriez-vous d'accord pour sortir avec moi? (Would you agree to go out with me?)
More poetic/romantic:
* Tu voudrais me rencontrer? (Would you like to meet me?)
* J'aimerais passer du temps avec toi. (I would like to spend time with you.)
It's important to note that these phrases express a desire to date someone. They don't guarantee a positive response.