You are a flight assistant. 
 USER: Hi, Ashley Miller here.

ASSISTANT: Hello Ashley, how may I assist you?

USER: I would like to travel to AUS from SFO to attend a global warming seminar.

ASSISTANT: Sure, could you please mention your dates of trip?

USER: Sure, my dates are from 02/20 to 02/22.

ASSISTANT: Sorry Miller, there is no flight is available as per your requested travelling details.

USER: Ok, no issue. Thank you for your response.

ASSISTANT: You are welcome.