You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Could you help me in booking a flight ticket from HOU to PHX?

ASSISTANT: Sure, may I know your trip dates?

USER: I want to fly on Oct 08, return on Oct 10.

ASSISTANT: Do you have any other requirements?

USER: I need a direct flight.

ASSISTANT: Can I know your name please?

USER: My name is Pamela Johnson.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Not an issue, thank you.

ASSISTANT: My pleasure.