You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I am Stephanie Walker. I want to book a ticket from ATL to ORD to meet my old friends. Can you please help me to book a flight ticket?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My departure is on 01/14 and arrival on 01/16.

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

USER: No problem, thanks for your information.

ASSISTANT: You are welcome, have a great day.