Someone tell the teller

I've been a long time customer of Chevy Chase Savings Bank and was at the teller window recently when I overheard the transaction going on next to me. The customer watned his $1,000 in 10 $100 bills. The teller told him that he only had one $100 bill and the rest would have to be in $50 bills. The teller ask, "Is that ok?" The customer said he'd prefer $100 bills. The teller told him that he only had the $50s and started counting out the money.

1. Was that really the only $100 bill the bank had? Or was it the only $100 bill that particular teller had at that moment? If the later, does the bank have a policy against allowing the teller to tade is $50 bills for $100s in the vault or with another teller?

2. Why did the teller ask the customer if it was "ok" to give him $50 bills if the customer's answer really didn't matter?

The ironic thing was that the teller in question's title was "Lead Customer Service Represntative" or something like that.