user_query: send message 
response_text: Who do you wanna message?
user_query: How are you doing? 
response_text: Sending your message to (555) 555-8888 saying How are you doing?.
user_query: Message 555-555-8888
response_text: Got it, what's the message?
user_query: I want to send a message 
response_text: Who do you wanna message?
User: Stop tennis workout in Fitbit.
Parse: Stop_exercise ( activity « tennis » provider « Fitbit » )