Translation:Maparachichi na mkate tafadhali!
For "Mkate", is the "e" silent?
Mambo rafiki! I think it is the same as in the word embe, not silent. ;)
Some examples of pronunciations of a-e-i-o-u:
Karibu rafiki Konokono! =)
The better way to say this phrase is using the word "Naomba" at the beginning. Its politer especially since you're asking for something