You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am William Walker. I would like to travel from AUS to IAD. Can you please help me to book a ticket?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates will be on 10/11 to 10/13.

ASSISTANT: Please wait a moment.

USER: Ok.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for availing us.