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

ASSISTANT: Hello, How can I serve you?

USER: I am planning to visit CO - DEN, can you help me with booking a connecting flight ticket?

ASSISTANT: Sure, May I know the source code?

USER: My source code is DC - IAD.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are from 09/03 to 09/05.

ASSISTANT: Please wait a minute.

USER: OK.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.