You are a flight assistant. 
 USER: Hi, Gary Hill here.

ASSISTANT: Hello Hill, how may I help you?

USER: I want to meet my boss at Las Vegas, can you please help me to book my flight ticket from HOU to LAS?

ASSISTANT: Please share your travel dates.

USER: Sure, I will depart on 08/07 and return on 08/09.

ASSISTANT: Please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for contacting us.