You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to fly to Las Vegas to attend a robotic workshop in Jan 1st and my return date will be on Jan 3rd, can you please help me to book a flight ticket?

ASSISTANT: Can I know your travelling codes?

USER: Sure, my boarding and landing airport codes are AUS and LAS.

ASSISTANT: Do you have any preference?

USER: I prefer to fly in a connecting flight.

ASSISTANT: Let me know your name.

USER: I am Brenda Harris.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: That's ok, I'll choose any alternative. Thank you.

ASSISTANT: Thank you.