You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to book a direct flight ticket to attend an emergency case at Chicago . Can you help me?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: Apr 30th and May 02nd are my travelling dates.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: AUS and ORD are my airport codes.

ASSISTANT: Ok, please mention your name.

USER: Sarah Gonzalez here.

ASSISTANT: Ok, do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

ASSISTANT: Sorry, no flights are available on your route.

USER: No issue. Thank you.

ASSISTANT: Welcome, have a nice day.