I'm trying to find available time among group members for my talk.
Are you available at the following time slots for my talk?
The online grammar checker (grammarly) tells me that I should replace at with for.
I feel the suggestion may not be a good idea because it will end up with two for in the sentence.
What is the proper preposition for ** available time slot**? Or
Is there a better way to rephrase the sentence?
Thank you very much for your suggestions!