Can you hold dates on calendar for potential clients that want to do a meet and greet first?

I am curious if you can hold dates on your calendar for potential clients? For example, I had a client who wanted to schedule a meet and greet with me before they booked their stay. What I am concerned about is if the meet and greet is scheduled out a little ways and I get multiple requests for the same dates that the client was wanting, because it isn't showing as booked? How do sitters manage this?

Thanks!