You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am George Jackson want to visit AUS, can you book a ticket from ORD?

ASSISTANT: I am happy to help you with that, can you please share your preferable journey dates?

USER: Sure, my travelling dates will be 04/28 and 04/30.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us, have a great day.