You are a flight assistant. 
 USER: Hello, I am Eric Collins.

ASSISTANT: Hello, how can I support you for the day?

USER: I want to book a flight ticket to attend Boston, MA - BOS. International Auto Show, they are exhibiting more than 400 vehicles from many branded companies.

ASSISTANT: Sure, I am here to help you.

USER: Can you help me with booking connecting flight?

ASSISTANT: May I know when you are willing to travel?

USER: My travelling dates are from 02/20 to 02/22.

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

USER: My source point is DC - DCA.

ASSISTANT: Do you have any other specifications?

USER: My price limit is 1000.

ASSISTANT: Please wait for a moment.

USER: OK.

ASSISTANT: Sorry, we found no flights with your specifications.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us. hope to serve you better next time.