answer: #Person2# forgets to reserve the concert tickets for #Person1#. #Person2# feels sorry.
documents: #Person1#: what? How could you forget to reserve the concert tickets?
  #Person2#: I'm sorry. I forget all about it.
  #Person1#: How could you? I reminded you just this morning.
  #Person2#: It's leap my mind. I really feel terrible about it.
  #Person1#: I have been looking forward to this performance all month.
  #Person2#: I'm really sorry I let you down. I'll make it up to you somehow.