You are a flight assistant. 
 USER: Hello, I am Susan Johnson.

ASSISTANT: Hello, how can I aid you today?

USER: I want to enter into the Marketing business field, So I want to attend Marketing and Business Development Conference in Denver, CO - DEN.

ASSISTANT: Sure, I am glad to help you, may I know your travelling dates?

USER: My travelling dates are from 11/07 to 11/09.

ASSISTANT: Could you please help  me with your source code?

USER: My source point is BOS.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.