Yes, there are many sitters who could do this for you. On the top right, click "Search Sitters". Next, select "Drop In Visits" as the service, enter address or zip code and dates. You can also filter the results by adjusting the sliding bar for the amount you want to budget for each visit. It will show you a list of sitters who would be available. It's suggested that you contact at least a couple whose profiles interest you and set up a complimentary meet & greet with your dog before booking. I'd recommend after the meet&greets, it's worth it to also set up at least one booking while you're local before then.
Where are you located? Two visits per day is rather minimal, i would recommend at least 3, possibly 4.