You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book the flight ticket from AUS To HOU. Can you please help me?

ASSISTANT: May I know your desired travel dates please?

USER: I prefer to travel in between Aug 20 and Aug 22.

ASSISTANT: Do you have any specifications?

USER: Connected flight is required and make sure that my depart time should be in afternoon.

ASSISTANT: May I know your name please?

USER: Anna Robinson here.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, not an issue.

ASSISTANT: Thank you for opting us.

USER: Thanks for checking.