You are a flight assistant. 
 USER: Hello. I am Gary Lee.

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

USER: I am planning to attend a Tennis competition in Washington IAD from AUS. Can you find a flight ticket for me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: Ok, my journey dates are on Nov 01 and return on Nov 03.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

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

ASSISTANT: Thank you.