The phrase "an assistance" is not correct in standard written English.
The correct form is "assistance" without the article "an" as it is an uncountable noun.
Example: "I need assistance with my project."
Alternatives: "help" or "support".
Developing an assistance robot for passengers in railway stations.
Results are applied to the design of an assistance for a simplified flight control system.
The objective of this study is to develop an assistance model for BIM implementation.
I had an accident years ago and use a wheelchair and an assistance dog.
When I started travelling with an assistance dog, it became even more difficult.
The author is the program coordinator with Lumina/Hope and Healing After Abortion, an assistance group.
"They said this money is an assistance from Obama," Mr. Agha was quoted as saying.
General Motors announced an assistance program for owners of its vehicles in affected counties.
The US Navy has set up an assistance centre for relatives of the crew.
The experimentation results show that the designed system could provide invaluable information for an assistance application for cooking.
He was accepted into an assistance program that is covering half his payroll for 10 employees for 13 weeks.
