The phrase "assistance if needed" is correct and usable in written English.
It can be used when offering help or support, indicating that assistance is available upon request or necessity.
Example: "Please feel free to reach out to me for assistance if needed during the project."
Alternatives: "help if required" or "support as necessary".
Doctors who had been treating Sharon would also offer technical and medical assistance if needed.
They advised him to call for police assistance if needed, a police statement said.
We remain in close touch with the government of Algeria and stand ready to provide assistance if needed.
British, US and Australian diplomats have flown in from neighbouring Sri Lanka to provide consular assistance, if needed, to tourists holidaying in the Maldives.
Older people then move on to more intensive assistance, if needed, with bathing, dressing and, where it is permitted, basic nursing care.
She noted that the United States already supplied defensive weapons to several of these countries, and was prepared to bolster its military assistance if needed.
Six months after the baseline interview, a packet of follow-up materials soliciting the same information collected at baseline was mailed to the participant's home, with interviewer assistance offered if needed.
Data are collected using a questionnaire, which is completed within 1 month before surgery by the patient (with assistance from staff if needed).
The in-person HE session is followed by up to two phone calls within six weeks to assess whether or not the participant went to the dentist, and offer assistance with scheduling if needed.
Members were expected not only to share materials, books and information, but to provide one another with "sympathy and practical assistance (if need be) in time of sickness and trouble".
(A 1-page step by step guideline will be provided and participants will be advised to contact the researcher for assistance, if need be).
