Using signup sheet, you can block few timeslots for the meeting and share with people.
Step 1: Go to "Appointment Booking"
Step 2: Click on "Manage Appointment Types" on Booking Page where you wish to offer this type of appointment.
Step 3: Click on "Add Appointment Type" and select "Manual" in how to set available times
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Step 4: Click on "Change Hours" on newly created signup sheet and click on "Change times"
Inside the page click on "Change Times" to add available times for meeting.
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Remember signup sheet does not take in consideration your calendar availability for these timeslots hence, a timeslot will only disappear if someone schedules meeting using signup sheet with you.
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Allowing only one person per appointment:
If you want to book meeting with single party, make sure you keep maximum guest capacity for each time as "1".
Hosting Group session:
If you are hosting a session where multiple parties can sign up and reserve a spot you can keep maximum guest capacity as per your own guest limit.