You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I want to book the flight ticket from AUS to SEA. Can you please help me?

ASSISTANT: Sure, I will aid you with that. Could you please mention your preferable travel dates?

USER: My travel dates are Aug 25th and Aug 27th.

ASSISTANT: May I know your name for further process?

USER: Nancy Lopez.

ASSISTANT: Is there any additional preferences do you have?

USER: I would like to depart in the evening and I like to return in the afternoon.

ASSISTANT: Do you have any another specification?

USER: I prefer to travel in business class with single connection.

ASSISTANT: Ok, please hold on a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.