You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephen Gonzalez.

ASSISTANT: How can I aid you at this moment?

USER: I am planning to visit Olympic National Park at Washington, could you please help me with booking a flight ticket from AUS to IAD?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: I would like to depart on May 25th and return on May 27th.

ASSISTANT: Do you need any halt in this journey?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any other specification for this trip?

USER: No, thank you for asking.

ASSISTANT: Stephen Gonzalez, we regret to inform you that there are no flight services are available on this route on your provided dates.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for opting us.