You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Patrick Lewis. Can you help me i booking from AUS to LAS, as there is a business meeting with my team?

ASSISTANT: May I know your desired travel dates please?

USER: My journey dates are 05/25 to 05/27.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No issue, thank you.

ASSISTANT: Thank you for opting us.