How to check existing in DB for any matching Room, BookDate and RoomId?

I have found a solution to my problem. I compare the TimeSlotId using Intersect, if there are intersection, it then return true.

public bool BookingExist(Booking booking)
    var resultContext = context.Bookings
        .Where(b => b.Room.Id == booking.RoomId && b.BookDate == booking.BookDate)
        .SelectMany(b => b.TimeSlots.Select(bt => bt.TimeSlotId))

    var resultInput = booking.TimeSlots.Select(bt => bt.TimeSlotId);

    if (resultContext.Intersect(resultInput).Count() > 0)
        return true;
        return false;

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