I suck at texting girls, how am I suppose to text?

Every time I text a girl, the conversation isn't really long and is kind of boring and the same. Like here is what would happen.

Me: Hey hows out going
Her: Nm u?
Me: same, any plans for the rest of the day
Her: Nah i have to work all day today
Me: Oh that sucks

Then that would be the end. I don't know how to continue on a conversation. Am I doing something wrong or is a short conversation like this acceptable?
I suck at texting girls, how am I suppose to text?
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