The high pitched phone/service voice that women (and men to a certain extent) use here is a form of politeness. It comes across as false and contrived to me but that is just an opinion. It is often combined with a form of breathless style speaking which is intended to show obsequiousness. The grammar forms often used in conjunction with this voice are more polite than that used for normal "talking to friends" grammar.

The repetition of phrases is often a call to come look at wares or to try somethi8ng that is currently being pushed. At convenience stores for example, they will often have a nonstop stream of "try the chicken" or "how about some of this/that". All part of a market style approach to gett8ing customers to look at or consider goods.