Clicking the open slot to the data table

Hi guys,

I’m automating booking page where user need to select a date and specific time first before booking. I want to loop to data table and find the open slot beyond the time which the user selected.

First: user needs to select a date and time start
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Second: It will navigate to the booking page and i need to click the open slot in the table

What is the best way to search for the open slot beyond the time which user selected? I hope you could help me to my project guys, thanks a lot.