Question:
Who was the chair of American Mathematical Society in Jun, 2019?

Context:
 Jill Pipher is the chair of American Mathematical Society from Jan, 2019 to Jan, 2021. 
 David Vogan is the chair of American Mathematical Society from Jan, 2017 to Jan, 2018. 
 Ruth Charney is the chair of American Mathematical Society from Jan, 2021 to Dec, 2022.

Answer:
Question:
Who was the chair of American Mathematical Society in Jun, 2019?

Context:
 Jill Pipher is the chair of American Mathematical Society from Jan, 2019 to Jan, 2021. 
 David Vogan is the chair of American Mathematical Society from Jan, 2017 to Jan, 2018. 
 Ruth Charney is the chair of American Mathematical Society from Jan, 2021 to Dec, 2022.

Answer:
user
Jill Pipher
assistant
Question:
Who was the chair of American Mathematical Society in Jun, 2019?

Context:
 Jill Pipher is the chair of American Mathematical Society from Jan, 2019 to Jan, 2021. 
 David Vogan is the chair of American Mathematical Society from Jan, 2017 to Jan, 2018. 
 Ruth Charney is the chair of American Mathematical Society from Jan, 2021 to Dec, 2022.

Answer:
user
Ruth Charney
David Vogan
assistant
Question:
Who was the chair of American Mathematical Society in Jun, 2019?

Context:
 Jill Pipher is the chair of American Mathematical Society from Jan, 2019 to Jan, 2021. 
 David Vogan is the chair of American Mathematical Society from Jan, 2017 to Jan, 2018. 
 Ruth Charney is the chair of American Mathematical Society from Jan, 2021 to Dec, 2022.

Answer:
user
Jill Pipher
assistant