This is VERY formal and polite and NOT commonly used. If you have a huge favor to ask someone in a very formal environment then this phrase could be used.
I personally have never used this phrase in real life. I would rather say: Would you please help me?
22 กุมภาพันธ์ 2017
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How naturally does it sound? @Be so kind as to help me, please.@ If I want to make a polite request for help.