You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking my ticket from PHX to AUS?

ASSISTANT: May I know your trip dates?

USER: My trip dates are from 01/20 to 01/22.

ASSISTANT: Sure, do you have any class preference?

USER: I would like to prefer economy class.

ASSISTANT: If you have any other requirements then please let me know.

USER: My depart time should be in the afternoon and I need a single connecting flight.

ASSISTANT: Ok, may I know your name please?

USER: My name is Timothy Roberts.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.