You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Betty Martin.

ASSISTANT: Betty, how can I assist you?

USER: I have to attend a meeting in Austin, can you please help me in booking flight ticket on these dates from 09/28 to 09/30?

ASSISTANT: Sure, I can help you to book your ticket. Please provide your source and destination airport codes.

USER: My origin airport code is PHX and destination airport code is AUS.

ASSISTANT: Let me check.

USER: Ok.

ASSISTANT: Sorry Betty, no flight.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.