You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Ryan White. My family member's planned for the trip to Austin, AUS. So, I need a flight ticket from IAD. Can you please help me?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travelling dates are 07/05 and 07/07.

ASSISTANT: Ok, wait a moment please.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no flights on your dates.

USER: It's ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.