خدمات حضوری.
مثال واضح:
Despite these benefits, many people are not as satisfied with a phone service as with a walk-in service.

a person, as a customer, patient, or interviewee, who arrives without an appointment: Many of the clinic's patients are walk-ins who suddenly need help.

While many of our services require prior appointments, we offer walk-in hours for certain situations.

Mental Health Emergencies
If you’re experiencing a mental health crisis and need immediate help, you don’t need an appointment to see us.

Walk-in hours for mental health emergencies are available:

9:00 a.m. to 5:00 p.m. weekdays

--------------------------------------------------
Note added at 41 mins (2017-09-15 10:57:35 GMT)
--------------------------------------------------

A walk-in clinic describes a very broad category of medical facilities only loosely defined as those that accept patients on a walk-in basis and with no appointment required. A number of healthcare service providers fall under the walk-in clinic umbrella including urgent care centers, retail clinics and even many free clinics or community health clinics. Walk-in clinics offer the advantages of being accessible and often inexpensive.[1] However amongst the negative aspects are that walk-in clinics provide poor quality healthcare as opposed to professional healthcare such as regular doctors and hospitals.[2] Other disadvantages may include the urgency to make the patient's visit as quick as possible in order to reduce the long waiting list of walk-ins at the clinic, which may fail to fulfill the purpose of the visit.[

--------------------------------------------------
Note added at 42 mins (2017-09-15 10:58:34 GMT)
--------------------------------------------------

https://en.wikipedia.org/wiki/Walk-in_clinic
and
dictionary farhang moaser

--------------------------------------------------
Note added at 45 mins (2017-09-15 11:01:41 GMT)
--------------------------------------------------

walk -in : آماده - راحت
بی دردسر و آسان

/