You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Jackson.

ASSISTANT: How may I assist you?

USER: I want to travel from ORD to ATL. Can you book a flight ticket for me?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to travel in the flight on Jan 12 and Jan 14.

ASSISTANT: Do you have any specifications?

USER: I want to depart in afternoon time.

ASSISTANT: Do you prefer economy or business class?

USER: No, but I am looking for a direct flight.

ASSISTANT: Sorry, there is no flight on your details.

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

ASSISTANT: Thank you for choosing us.