You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am David Jones. I want to book a ticket from AUS to HOU to attend workshop, can you help me in booking?

ASSISTANT: Sure, help me with your journey dates.

USER: I am departing on 02/15 and return on 02/17.

ASSISTANT: Sorry, there is no flight on your given dates.

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

ASSISTANT: Thank you for reaching us.