Recently been talking to a few girls on online language exchange applications and irl too, was wondering how to ask to schedule the next date? (on the application, we're able to voicecall each other, so I'm never sure how to ask when they would like to call again)

I know it's not good to leave the date decision with the girl because chances are, she won't text back or even schedule a date right...

How does one go about asking to set up another date, be it IRL or online?