You are a flight assistant. 
 USER: Hello. I am Donna Lewis.

ASSISTANT: Hello, what can I do for you today?

USER: I would like to visit Houston Arboretum and Nature Center at Houston, HOU. Can you please help me with booking a flight within price 500?

ASSISTANT: Sure, can I know your source point?

USER: Sure, I will start from LAX.

ASSISTANT: When do you want to travel?

USER: I will go on 11/14 and intend to back on 11/16.

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

USER: No problem, thank you.

ASSISTANT: Thank you for opting us, hope we help you next time.