You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from SEA to AUS, Can you please help me for booking?

ASSISTANT: Sure, may I know your trip dates please?

USER: I would like to travel on 10/31 to return on 11/01.

ASSISTANT: Do you have any other requirements?

USER: I need a economy class with connecting flight.

ASSISTANT: Can I know your name please?

USER: Matthew Lopez.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Most welcome.