You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Can you please check for the available from HOU to LAS?

ASSISTANT: Sure, may I know your name?

USER: My journey dates are from Aug 22 to Aug 24. My name is Larry Clark.

ASSISTANT: Do you have any other specifications?

USER: I only need a direct flight, I don't have other requirements.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.