[{'role': 'USR', 'utterance': "I'm planning to go to Canada on vacation."}
 {'role': 'SYS', 'utterance': 'What places are you going to visit?'}
 {'role': 'USR', 'utterance': "First, I'll spend a few days in Vancouver. Then I'll take a train through the Rocky Mountains."}
 {'role': 'SYS', 'utterance': "Oh, you're riding through the Rocky Mountains. That's really exciting."}
 {'role': 'USR', 'utterance': "Then I'll fly to Toronto and take a bus to Niagara Falls. I will take a boat under that huge waterfall."}]
{'role': 'SYS', 'utterance': "Wow, that's wonderful. You're so lucky!"}