You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you find me normal-cost airline to visit Phoenix?

ASSISTANT: Ok, could you please share your location airport codes?

USER: I will fly from AUS to PHX.

ASSISTANT: Ok, may I know your name please?

USER: My name is Alexander Hernandez.

ASSISTANT: Ok. On which dates you need booking?

USER: I will travel on Dec 10 and return on Dec 12.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer a connecting flight. Please book my return flight in evening.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

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

USER: Ok, thank you for the information.

ASSISTANT: You are welcome, have a great day.