answer: #Person1# helps #Person2# purchase Treasury Certificates and tells #Person2# #Person2# can't cash them until maturity.
documents: #Person1#: Good afternoon. Can I be of service?
  #Person2#: I don't know. Can I purchase Treasury Certificates here at this counter?
  #Person1#: Yes, of course. We have Treasury Notes with two, three and five-year terms available.
  #Person2#: Two years is fine, with a value of 1, 000 RIB.
  #Person1#: OK, could I take a look at some ID please, like a passport?
  #Person2#: Here you go. By the way, is it possible to cash them before the maturity comes up?
  #Person1#: No, I'm afraid that isn't possible. You must wait until maturity before you cash them.