You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I need to travel from PHX to AUS, can you help me in doing that?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are Sep 18 to 20.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight in economy class.

ASSISTANT: May I know your name?

USER: I am Sarah Hall.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for reaching us.