You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am William Phillips, I have to visit Las Vegas because my friend met with an accident. Can you please help me to book my ticket from AUS to LAS?

ASSISTANT: Ok, may I know your travelling dates please?

USER: I want to depart on 09/10 and return on 09/12.

ASSISTANT: Sorry, no flights found as per your requested dates.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.