You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I planned to attend for a meeting in HOU, can you please help me to book a flight ticket from AUS?

ASSISTANT: Sure, can you provide your trip dates?

USER: I prefer to travel on Jun 2 and Jun 4.

ASSISTANT: Do you have any preferences?

USER: I would like to depart in evening.

ASSISTANT: May I know your name?

USER: I am Charles Perez.

ASSISTANT: Sorry, there is no flight on your given preferences.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.