How do cutomer care representatives normally address a caller?

Is it common to say sir or ma'am? Do Americans generally prefer to be called by the first name (regardless of the age difference between the caller and the recipient)?
Is it ever possible to use Mr/Ms + First name (i.e. Did I get your number right Sir Arnold) on the phone?
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Comments  (Page 2) 
Is the frequent use of SIR here a bit too obsequious?
lagatawIs the frequent use of SIR here a bit too obsequious?
another case of pre-answered follow-up question! Thanks GG
Students: Are you brave enough to let our tutors analyse your pronunciation?
Grammar GeekThat WILL be or that IS $46.95. Will the driver need to make change?
Wait I'm confused.
Without this question Will the driver need to make change? would the reply sound ambiguous?
I mean could Change for fifty mean either [fifty dollars in smaller ddenominations or in coins] or [$3.05]?
He has to pay you $46.95.

Think about this.
There is no point in giving him four 10s, one 5, four 1s, three quarters, two dimes, and a nickel so that he can then give the driver four 10s, one 5, one 1, 3 quarters and two dimes. The driver should just give him the change from the $50, which is $3.05.

If you do not have a purchase pending, then "can you make change" or "can you break this $50" means give me smaller bills. But with a pending purchase, you simply get the difference.
Thanks very much!

It's all clear now!
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