You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit library of congress at Washington, can you please help me in ticket booking with direct flight?

ASSISTANT: Sure, please provide your travelling dates.

USER: My planned dates for this journey are from 11/09 to 11/11.

ASSISTANT: May I know your good name?

USER: I am Joshua Evans.

ASSISTANT: May I know your journey codes?

USER: My boarding point is AUS and my landing point is IAD.

ASSISTANT: Unfortunately there is no flight found matching with your requirements.

USER: It's ok. Thank you.

ASSISTANT: Thank you for availing us.