You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a ticket from JFK to AUS. Could you book a ticket?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Departure is by Feb, 18 and return date is Feb, 20.

ASSISTANT: Can I have your name please?

USER: I am Kathleen Anderson.

ASSISTANT: Kathleen Anderson, no flights has been found on your planned travel dates.

USER: Thanks.

ASSISTANT: Thank you for choosing us.