You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Rebecca Campbell here. I want to meet my sister-in-law to discuss about our family issues. Please book my ticket from AUS to SEA.

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My trip dates are 02/21 and 02/23.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: No problem, thank you.

ASSISTANT: You are welcome, have a great day.