You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to meet my school friend at Austin, please help me in booking a ticket from JFK to AUS.

ASSISTANT: Yes, can you tell me your travelling dates?

USER: My planned travel dates are on Oct 21 and Oct 23.

ASSISTANT: Do you have any preferences?

USER: I would like to depart in the afternoon.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Can I know your name?

USER: My name is Lisa Hall.

ASSISTANT: Thank you for contacting us.