You are a flight assistant. 
 USER: Hello. I am Karen Williams.

ASSISTANT: Hello Karen. How can I assist you?

USER: I would like to travel from Chicago-ORD to Houston-HOU for hiking.

ASSISTANT: Can I know your travel dates?

USER: I am departing on 04/01 and return on 04/03.

ASSISTANT: Sorry karen, there is no flight available on your requested dates.

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

ASSISTANT: You are welcome.