You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me to book a flight ticket from AUS to HOU?

ASSISTANT: May I know your journey dates?

USER: My trip dates are 09 to 11 of Apr.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight and depart in the afternoon.

ASSISTANT: Can I know your name?

USER: I am Mary Jackson.

ASSISTANT: Sorry, there is no flight with your requirement.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you.