Question:
Which employer did Mun Choi work for in Apr, 1999?

Context:
 Mun Choi works for University of Missouri from Jan, 2017 to Dec, 2022. 
 Mun Choi works for Drexel University from Jan, 2000 to Jan, 2008. 
 Mun Choi works for University of Illinois at Chicago from Jan, 1996 to Jan, 2000.

Answer:
Question:
Which employer did Mun Choi work for in Apr, 1999?

Context:
 Mun Choi works for University of Missouri from Jan, 2017 to Dec, 2022. 
 Mun Choi works for Drexel University from Jan, 2000 to Jan, 2008. 
 Mun Choi works for University of Illinois at Chicago from Jan, 1996 to Jan, 2000.

Answer:
user
University of Illinois at Chicago
assistant
Question:
Which employer did Mun Choi work for in Apr, 1999?

Context:
 Mun Choi works for University of Missouri from Jan, 2017 to Dec, 2022. 
 Mun Choi works for Drexel University from Jan, 2000 to Jan, 2008. 
 Mun Choi works for University of Illinois at Chicago from Jan, 1996 to Jan, 2000.

Answer:
user
University of Missouri
Drexel University
assistant
Question:
Which employer did Mun Choi work for in Apr, 1999?

Context:
 Mun Choi works for University of Missouri from Jan, 2017 to Dec, 2022. 
 Mun Choi works for Drexel University from Jan, 2000 to Jan, 2008. 
 Mun Choi works for University of Illinois at Chicago from Jan, 1996 to Jan, 2000.

Answer:
user
University of Illinois at Chicago
assistant