Looking on the internet deeply has found these results:

once again for your assistance is the most popular phrase on the web.

ask for your assistance as usual 10 results on the web	once again for your assistance 12,810 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Thank you, once again, for your assistance in promoting our first golf tournament through direct marketing. The Golf Tournament Committee met after the ... "Thank you once again for your assistance and professionalism in resolving this matter." “I want to thank you once again for your assistance in helping me launch the AT&T Universal Card. The press conference got increasingly better, and the ... “I just wanted to thank you once again for your assistance in getting my refund. It was my pleasure doing business with you, and I would highly recommend your ... Deidre G May 2013. "Many thanks for the handling of this for me and ...

ask for your assistance as usual

10 results on the web

once again for your assistance

12,810 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Thank you, once again, for your assistance in promoting our first golf tournament through direct marketing. The Golf Tournament Committee met after the ...
"Thank you once again for your assistance and professionalism in resolving this matter."
“I want to thank you once again for your assistance in helping me launch the AT&T Universal Card. The press conference got increasingly better, and the ...
“I just wanted to thank you once again for your assistance in getting my refund. It was my pleasure doing business with you, and I would highly recommend your ...
Deidre G May 2013. "Many thanks for the handling of this for me and ...