user_query: contact3134@fakeemail.com
response_text: OK, you want to email contact3134@fakeemail.com. What's the message?
user_query: Send an email to Ethan,  my next meeting that I will be late.
response_text: Alright, the subject is "my next meeting that I will be late.." Who do you wanna email?
User: I'm gonna start my pilates, I mean, cardio class.
Parse: Start_exercise ( activity « cardio » )