Marshallese interpreter

We have a client with 75 employees who speak Marshallese and need an interpreter for a week to help us conduct phone calls with each. We explain employee insurance benefits and help employees make their elections in those plans. We would be looking for a week to be connected to a webex and assist our employee, most likely in November. We have other prospects in the area that, if successful, this could help us win those deals, of course we would need these services again at that point.