You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a ticket from AUS to IAH. Could you book a ticket?

ASSISTANT: May I know your travel dates?

USER: Departure is by July, 31 and return date is Aug, 2.

ASSISTANT: Do you prefer connecting flight?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any other specifications?

USER: I prefer to travel in business class.

ASSISTANT: May I know your good name?

USER: My name is Nancy Parker.

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

USER: Thanks.

ASSISTANT: Thank you for reaching us.