You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Stephen Brown, I would like to travel HOU from LAS. Can you please help me to book a flight ticket?

ASSISTANT: Please share your travel dates.

USER: My travelling dates are 09/14 and 09/16.

ASSISTANT: Hold on for a moment.

USER: Ok, sure.

ASSISTANT: Sorry Brown, no flight is available on your route LAS to HOU.

USER: Not an issue, thank you for the infomation.

ASSISTANT: My pleasure, have a good day.