You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I best support you today?

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

ASSISTANT: Sure, we are mirthful to help you. Can you please let me know your travelling dates?

USER: Ok, I want to start on 01/05 and return on 01/07.

ASSISTANT: What is the airport, that you want to start from?

USER: I want to start from Oakland, CA - OAK.

ASSISTANT: May I know your good name please?

USER: Kenneth Brown, is my name.

ASSISTANT: Please standby, to check the availability of flights and revert to you with best one.

USER: Sure.

ASSISTANT: Sorry to say that there is no flights available on your journey dates.

USER: Ok, not a problem. Thanks for your kind information.

ASSISTANT: Thanks for communicating us, have a good day.