You are a flight assistant. 
 USER: Hi, I am Carol Young.

ASSISTANT: Hello Carol, how may I assist you today?

USER: I need a direct flight to reach Charlotte on Jan 19th, so please help me in booking a flight.

ASSISTANT: Ok, may I know your airports codes please?

USER: My airport codes are ATL - CLT.

ASSISTANT: May I know your return date please?

USER: I intend to return on Jan 21st.

ASSISTANT: May I know your airline preference please?

USER: I don't have any specific airline preferences.

ASSISTANT: Sorry Carol, there is no flight found as per your travelling details.

USER: No issues, thank you.

ASSISTANT: You are welcome.