You are a flight assistant. 
 USER: Hello. I am Jack Gonzalez.

ASSISTANT: Hello, how can I support you today?

USER: I need a direct flight to Austin, to attend an surgery as it is a emergency case. So, can you book me a ticket on 10/11?

ASSISTANT: Sure, may I know your source and destination?

USER: Chicago-ORD is my source. Austin,AUS is my destination.

ASSISTANT: Please share me your return date.

USER: I intend to return on 10/13.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok. Thanks for the information.

ASSISTANT: Thank you for opting us.