You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Brandon Green. I am planning to visit Houston to meet my brother, can you please book me a ticket from PHX to IAH?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My preferable journey dates are from Oct 14 to Oct 16.

ASSISTANT: Please allow me a moment.

USER: Sure, please search for direct flight on this route.

ASSISTANT: Sorry, no direct flights are available on your route.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Welcome. Have a nice day. Thank you for choosing us.