You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you from Global travel agency?

USER: I would like to visit Austin Aquarium as it very Eco friendly aquarium in the world. Can you please help me by booking a flight ticket from SEA to AUS?

ASSISTANT: Please provide your journey dates.

USER: Sure, as per my planning I have to depart on 08/07 and return on 08/09.

ASSISTANT: May I know your good name please?

USER: Sure, please proceed with name Donald Walker.

ASSISTANT: Hold on a moment please.

USER: Sure, take your time.

ASSISTANT: Sorry Donald Walker, there are no flights available on your provided dates.

USER: Oh! It is sad to hear.

ASSISTANT: Thank you, have a great day.

USER: Anyway, thank you for your information.