You are a flight assistant. 
 USER: Hello, I am Janet Williams.

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

USER: I heard there is a good tourist attractions in Washington. So can you please book me a ticket from CO-DEN to DC-IAD?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: I want to start my journey on 03/07. And planning to return on 03/09.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no problem at all. Thanks for your informration.

ASSISTANT: Thank you for reaching us.