Question:
Who was the chair of Embassy of Ukraine, Berlin in May, 2015?

Context:
 Yurii V. Kostenko is the chair of Embassy of Ukraine, Berlin from Dec, 1994 to Sep, 1997. 
 Pavlo Klimkin is the chair of Embassy of Ukraine, Berlin from Jun, 2012 to Jun, 2014. 
 Natalia Zarudna is the chair of Embassy of Ukraine, Berlin from Sep, 2008 to Dec, 2011. 
 Andriy Melnyk is the chair of Embassy of Ukraine, Berlin from Dec, 2014 to Dec, 2022. 
 Anatolij Ponomarenko is the chair of Embassy of Ukraine, Berlin from Sep, 1997 to Nov, 2003. 
 Ihor Dolhov is the chair of Embassy of Ukraine, Berlin from Dec, 2005 to Apr, 2008. 
 S. A. Farenik is the chair of Embassy of Ukraine, Berlin from Nov, 2003 to Jul, 2005.

Answer:
Question:
Who was the chair of Embassy of Ukraine, Berlin in May, 2015?

Context:
 Yurii V. Kostenko is the chair of Embassy of Ukraine, Berlin from Dec, 1994 to Sep, 1997. 
 Pavlo Klimkin is the chair of Embassy of Ukraine, Berlin from Jun, 2012 to Jun, 2014. 
 Natalia Zarudna is the chair of Embassy of Ukraine, Berlin from Sep, 2008 to Dec, 2011. 
 Andriy Melnyk is the chair of Embassy of Ukraine, Berlin from Dec, 2014 to Dec, 2022. 
 Anatolij Ponomarenko is the chair of Embassy of Ukraine, Berlin from Sep, 1997 to Nov, 2003. 
 Ihor Dolhov is the chair of Embassy of Ukraine, Berlin from Dec, 2005 to Apr, 2008. 
 S. A. Farenik is the chair of Embassy of Ukraine, Berlin from Nov, 2003 to Jul, 2005.

Answer:
user
Andriy Melnyk
assistant
Question:
Who was the chair of Embassy of Ukraine, Berlin in May, 2015?

Context:
 Yurii V. Kostenko is the chair of Embassy of Ukraine, Berlin from Dec, 1994 to Sep, 1997. 
 Pavlo Klimkin is the chair of Embassy of Ukraine, Berlin from Jun, 2012 to Jun, 2014. 
 Natalia Zarudna is the chair of Embassy of Ukraine, Berlin from Sep, 2008 to Dec, 2011. 
 Andriy Melnyk is the chair of Embassy of Ukraine, Berlin from Dec, 2014 to Dec, 2022. 
 Anatolij Ponomarenko is the chair of Embassy of Ukraine, Berlin from Sep, 1997 to Nov, 2003. 
 Ihor Dolhov is the chair of Embassy of Ukraine, Berlin from Dec, 2005 to Apr, 2008. 
 S. A. Farenik is the chair of Embassy of Ukraine, Berlin from Nov, 2003 to Jul, 2005.

Answer:
user
Anatolij Ponomarenko
Ihor Dolhov
S. A. Farenik
Natalia Zarudna
Pavlo Klimkin
Yurii V. Kostenko
assistant
Question:
Who was the chair of Embassy of Ukraine, Berlin in May, 2015?

Context:
 Yurii V. Kostenko is the chair of Embassy of Ukraine, Berlin from Dec, 1994 to Sep, 1997. 
 Pavlo Klimkin is the chair of Embassy of Ukraine, Berlin from Jun, 2012 to Jun, 2014. 
 Natalia Zarudna is the chair of Embassy of Ukraine, Berlin from Sep, 2008 to Dec, 2011. 
 Andriy Melnyk is the chair of Embassy of Ukraine, Berlin from Dec, 2014 to Dec, 2022. 
 Anatolij Ponomarenko is the chair of Embassy of Ukraine, Berlin from Sep, 1997 to Nov, 2003. 
 Ihor Dolhov is the chair of Embassy of Ukraine, Berlin from Dec, 2005 to Apr, 2008. 
 S. A. Farenik is the chair of Embassy of Ukraine, Berlin from Nov, 2003 to Jul, 2005.

Answer:
user
Andriy Melnyk
assistant