repartee vs thank-you note

repartee

verb
  • To have a repartee (conversation marked by repartees) 

  • To reply with a repartee 

noun
  • A conversation marked by a series of witty retorts. 

  • Skill in replying swiftly and wittily. 

  • A swift, witty reply, especially one that is amusing. 

thank-you note

How often have the words repartee and thank-you note occurred in a corpus of books? (source: Google Ngram Viewer )