context: |
  Oldest tree in Brno is in Bystrc. It is linden older than 400 years.
  Bystrc is hub of public transport incluting buses, trams and troleybuses.
  From spring till autum there are electric ships serving as public transport.
model-answer: "\nI'm checking the opening hours of the marina on Bystrc lake. The
  marina is \nopened from April 15 until October 31.\n\nSo, it's possible to travel
  by ship on Bystrc lake from April 15 to October 31.\n\nDoes this answer your question?
  If you have any other questions, please feel \nfree to ask."
original-answer: |
  Main season is from spring to autum
question: |
  When is possible to travel by ship on Bystrc lake?