You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Raymond Jones.

ASSISTANT: How can I help you at this moment?

USER: Can you please assist me in booking a flight ticket to IAD from AUS?

ASSISTANT: Sure. Could you please mention your travel dates for further process?

USER: I would like to start on May 03 and need to return on May 05.

ASSISTANT: Do you have any another specifications?

USER: Yes, I need a connecting flight. Price should not exceed 500.

ASSISTANT: Ok, please wait a moment, I will check flight availability in this route.

USER: Ok.

ASSISTANT: Sorry no flights are available in this route as per your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.