You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Could you help me in booking a flight ticket from AUS to HOU?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: I want to fly on Apr 16, return on Apr 18.

ASSISTANT: May I know your name to proceed further?

USER: My name is William Turner.

ASSISTANT: Do you have any requirement to be met?

USER: My depart time should be evening.

ASSISTANT: Sorry William Turner, there is no flight as per your requirement.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us William Turner.