Question:
Who was the head of Aachen in Aug, 2021?

Context:
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989.

Answer:
Question:
Who was the head of Aachen in Aug, 2021?

Context:
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989.

Answer:
user
Sibylle Keupen
assistant
Question:
Who was the head of Aachen in Aug, 2021?

Context:
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989.

Answer:
user
Albert Maas
Jürgen Linden
Marcel Philipp
Kurt Malangré
Hermann Heusch
assistant
Question:
Who was the head of Aachen in Aug, 2021?

Context:
 Jürgen Linden is the head of the government of Aachen from Oct, 1989 to Oct, 2009. 
 Hermann Heusch is the head of the government of Aachen from Jan, 1952 to Jan, 1973. 
 Albert Maas is the head of the government of Aachen from Jan, 1946 to Jan, 1952. 
 Marcel Philipp is the head of the government of Aachen from Oct, 2009 to Nov, 2020. 
 Sibylle Keupen is the head of the government of Aachen from Nov, 2020 to Dec, 2022. 
 Kurt Malangré is the head of the government of Aachen from Jan, 1973 to Oct, 1989.

Answer:
user
Sibylle Keupen
assistant