You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I need to book a ticket from PHX to AUS. Could you book a ticket?

ASSISTANT: Please provide your journey dates.

USER: Departure date is May, 19 and return is by May, 21.

ASSISTANT: Do you need any connection limit?

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 name?

USER: I am Rachel Nelson.

ASSISTANT: There are no flights available on your routes.

USER: Thanks.

ASSISTANT: Thank you for choosing us.