You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin King.

ASSISTANT: How may I assist you today?

USER: Please book me a ticket from JFk to AUS to meet my family.

ASSISTANT: Sure, please provide me your travelling dates.

USER: I have planned to travel on 02/23 and 02/25.

ASSISTANT: Wait for a minute. Sorry, I could not find any flight with your travelling dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome.