You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am Jason Davis. I am planning to travel from AUS to ORD, can you help in booking a flight for me?

ASSISTANT: Sure, I am here to help with that. Can I know your travelling dates?

USER: My travelling dates are 03/19 to 03/21.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: That's fine, thank you for your information.

ASSISTANT: Thank you for consulting us. Have a nice day.