You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Andrew Robinson want to visit Atlanta, can you book a ticket from ORD to ATL?

ASSISTANT: Sure, can you please share your travel dates?

USER: Sure, my travelling dates will be 01/13 and 01/15.

ASSISTANT: Let me check for the availability of flight.

USER: Ok.

ASSISTANT: Andrew, I am sorry to inform you that there is no flight available at your requested dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us, have a great day.